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Olmos I, Ricciardi C, Mato M, Guevara N, Acuña S, Maldonado C, Vázquez M, Toledo M, Menéndez C, Blanco V, Badano JL, Cayota A, Spangenberg L, Cardenas-Rodriguez M. Optimization of Clozapine Treatment: Study of Variables Affecting Response in Uruguayan Patients With Schizophrenia. J Clin Psychopharmacol 2025; 45:20-27. [PMID: 39714785 DOI: 10.1097/jcp.0000000000001933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2024]
Abstract
PURPOSE/BACKGROUND Clozapine is the recommended drug for treatment-resistant schizophrenia. Drug response could be affected by numerous factors such as age, sex, body mass index, co-medication, consumption of xanthine-containing beverages, smoking, and genetic variants of the enzymes involved in clozapine metabolism (CYP1A2, CYP3A4, and, to a lesser extent, CYP2C19 and CYP2D6). This study evaluated genetic and nongenetic variables that may affect clozapine plasma concentrations in Uruguayan patients with schizophrenia. METHODS/PROCEDURES Demographic data including sex, age, ethnicity, body weight, smoking habit, concomitant medication, and xanthine consumption were collected through a data collection form. Clozapine and norclozapine concentrations were determined using an HPLC system equipped with a UV detector. Genetic variants were determined through next-generation sequencing using Illumina sequencing technology and a panel of DNA probes. FINDINGS/RESULTS Fifty patients were included in the study. After evaluation, only tobacco use and obesity had a significant impact on clozapine exposure (P < 0.05). The high prevalence of the genetic variant CYP1A2*1F may account for the significant impact that tobacco smoking has on clozapine concentrations. Some common adverse effects observed in this study depend on clozapine plasma concentrations, such as constipation and sialorrhea. IMPLICATIONS/CONCLUSIONS These types of studies provide the clinician with tools to optimize clozapine therapy, attempting to use the minimum effective dose and attenuating the burden of concentration-dependent adverse reactions.
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Affiliation(s)
- Ismael Olmos
- From the Pharmacology Clinic Unit, Department of Pharmacy, Hospital Vilardebó
| | - Carina Ricciardi
- Clinic of Hospital Vilardebó, Administración de Servicios de Salud del Estado
| | - Mauricio Mato
- From the Pharmacology Clinic Unit, Department of Pharmacy, Hospital Vilardebó
| | - Natalia Guevara
- Pharmaceutical Sciences Department, Faculty of Chemistry, Universidad de la República; Therapeutic Drug Monitoring Unit, Hospital de Clínicas Dr Manuel Quintela, Universidad de la República
| | - Sabrina Acuña
- Pharmaceutical Sciences Department, Faculty of Chemistry, Universidad de la República; Therapeutic Drug Monitoring Unit, Hospital de Clínicas Dr Manuel Quintela, Universidad de la República
| | - Cecilia Maldonado
- Pharmaceutical Sciences Department, Faculty of Chemistry, Universidad de la República; Therapeutic Drug Monitoring Unit, Hospital de Clínicas Dr Manuel Quintela, Universidad de la República
| | - Marta Vázquez
- Pharmaceutical Sciences Department, Faculty of Chemistry, Universidad de la República; Therapeutic Drug Monitoring Unit, Hospital de Clínicas Dr Manuel Quintela, Universidad de la República
| | | | - Clara Menéndez
- Human Molecular Genetics Laboratory, Institut Pasteur de Montevideo
| | | | - José L Badano
- Human Molecular Genetics Laboratory, Institut Pasteur de Montevideo
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Kikuchi Y, Otsuka Y, Ito F, Yada Y, Tanifuji H, Komatsu H, Tomita H. Relationship Between Clozapine-Induced Inflammation and Eosinophilia: A Retrospective Cohort Study. Schizophr Bull 2024:sbae213. [PMID: 39680690 DOI: 10.1093/schbul/sbae213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2024]
Abstract
BACKGROUND AND HYPOTHESIS Eosinophilia has not been highlighted in clozapine-induced adverse inflammatory events, as it is often asymptomatic and self-limiting, while drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome occurs rarely. This study aimed to reveal the temporal relationships between eosinophilia and other inflammatory events during clozapine initiation. STUDY DESIGN The temporal relationships between eosinophilia and other inflammatory events were evaluated among 241 patients with schizophrenia treated with clozapine for the first time at 7 hospitals. Risk factors for eosinophilia were investigated among preceding inflammatory events and other clinical characteristics. Furthermore, patients with eosinophilia were stratified by the severity of adverse inflammatory events and their clinical characteristics were compared. STUDY RESULTS Of the 54 patients who experienced inflammatory adverse events, 27 (50%) developed eosinophilia. In all but 1 patient, clinical symptoms of inflammatory adverse events preceded eosinophilia. In contrast, of the 187 patients without inflammatory events, 21 (11%) developed eosinophilia. Multivariate analysis revealed that more severe preceding inflammatory adverse events were associated with a greater risk of eosinophilia. The median time to the first detection of eosinophilia and peak eosinophil count occurred significantly earlier in patients with severe adverse events than in asymptomatic patients. CONCLUSIONS In most cases, eosinophilia developed after the onset of inflammatory symptoms. Preceding inflammation was associated with the development of clozapine-induced eosinophilia. Eosinophilia may not be suitable as an early detection marker of severe inflammatory adverse effects. These findings enhanced our understanding of the involvement of eosinophilia in clozapine-induced inflammatory events.
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Affiliation(s)
- Yuki Kikuchi
- Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, 980-8574, Japan
- Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, 986-0873, Japan
| | - Yuji Otsuka
- Department of Psychiatry, Asahi General Hospital, Asahi, 289-2511, Japan
| | - Fumiaki Ito
- National Hospital Organization Hanamaki Hospital, Hanamaki, 025-0033, Japan
| | - Yuji Yada
- Department of Psychiatry, Okayama Psychiatric Medical Center, Okayama, 700-0915, Japan
| | - Hiroaki Tanifuji
- Department of Pharmacy, Kodama Hospital, Ishinomaki, Miyagi, 986-0873, Japan
| | - Hiroshi Komatsu
- Department of Psychiatry, Tohoku University Hospital, Sendai, Miyagi, 980-8574, Japan
| | - Hiroaki Tomita
- Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, 980-8574, Japan
- Department of Psychiatry, Tohoku University Hospital, Sendai, Miyagi, 980-8574, Japan
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De las Cuevas C, Sanz EJ, de Leon J. Pharmacovigilance in Action: Utilizing VigiBase Data to Improve Clozapine Safety. Patient Prefer Adherence 2024; 18:2261-2280. [PMID: 39553897 PMCID: PMC11568851 DOI: 10.2147/ppa.s495254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2024] [Accepted: 10/30/2024] [Indexed: 11/19/2024] Open
Abstract
Purpose Clozapine is an antipsychotic which was approved in 1989 for treatment-resistant schizophrenia in the United States (US). There were few randomized trials before its approval and potentially lethal clozapine adverse drug reactions (ADRs), such as agranulocytosis and myocarditis were identified by pharmacovigilance. VigiBase, the WHO global database, is a cornerstone of international pharmacovigilance efforts for ADR identification during post-marketing surveillance. This systematic review of the literature explores additional contributions to the knowledge of clozapine ADRs from recent VigiBase studies. Methods Using the terms "clozapine AND VigiBase" we conducted an article search in PubMed on September 5, 2024. Of the 29 articles, 11 were excluded and 18 described in the Results section. Results All clozapine ADRs were described in two VigiBase studies. One on pregnancy indicated no increased risk with clozapine compared with other antipsychotics; the other reported 191,557 clozapine ADRs, including 22,956 fatal outcomes through January 15, 2023, and paid attention to the reporting style of the top 4 reporting countries (the US, the United Kingdom, Canada and Australia). Infections were described in three VigiBase studies where clozapine treatment was associated with infections, respiratory aspiration, and pneumonia. Rapid titration can lead to localized clozapine-induced inflammations including myocarditis, pericarditis or pancreatitis, or generalized inflammations such as drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome. Clozapine-induced inflammation was described in four VigiBase studies, two focused on all ages (myocarditis and DRESS) and two on youth (myocarditis and another on pericarditis and pancreatitis). Other specific ADRs were described in nine VigiBase studies (hematological malignancies, rhabdomyolysis, sialorrhea, seizures, diabetes mellitus, drug-induced parkinsonism, withdrawal symptoms, and suicidal behaviors). Conclusion The spectrum of respiratory aspiration - aspiration pneumonia - pneumonia and other infections are significant causes of fatal outcomes in clozapine-treated patients. Clozapine had anti-suicidal effects versus other antipsychotics across all VigiBase labels of suicidal behavior.
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Affiliation(s)
- Carlos De las Cuevas
- Department of Internal Medicine, Dermatology, and Psychiatry and Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, La Laguna, Canary Islands, Spain
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, Universidad de La Laguna, La Laguna, Canary Islands, Spain
- Clinical Pharmacology Service, Hospital Universitario de Canarias, La Laguna, Canary Islands, Spain
| | - Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Hospital, University of the Basque Country, Vitoria, Spain
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Kikuchi Y, Kurosawa M, Sakata M, Takahashi Y, Yamamoto K, Tomita H, Yoshio T, Yasui-Furukori N. Effects of titration speed, gender, obesity and concomitant medications on the risk and onset time of clozapine-associated fever among Japanese patients with schizophrenia: retrospective review of charts from 21 hospitals. Br J Psychiatry 2024; 225:492-498. [PMID: 39104017 DOI: 10.1192/bjp.2024.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/07/2024]
Abstract
BACKGROUND Clozapine-induced inflammation, such as myocarditis and pneumonia, can occur during initial titration and can be fatal. Fever is often the first sign of severe inflammation, and early detection and prevention are essential. Few studies have investigated the effects of clozapine titration speed and concomitant medication use on the risk of clozapine-induced inflammation. AIMS We evaluated the risk factors for clozapine-associated fever, including titration speed, concomitant medication use, gender and obesity, and their impact on the risk of fever and the fever onset date. METHOD We conducted a case-control study. The medical records of 539 Japanese participants with treatment-resistant schizophrenia at 21 hospitals in Japan who received clozapine for the first time between 2010 and 2022 were retrospectively investigated. Of these, 512 individuals were included in the analysis. Individuals were divided into three groups according to the titration rate recommended by international guidelines for East Asians: the faster titration group, the slower titration group and the ultra-slower titration group. The use of concomitant medications (such as antipsychotics, mood stabilisers, hypnotics and anxiolytics) at clozapine initiation was comprehensively investigated. Logistic regression analysis was performed to identify the explanatory variables for the risk of a fever of 37.5°C or higher lasting at least 2 days. RESULTS Fever risk significantly increased with faster titration, male gender and concomitant use of valproic acid or quetiapine. No increased fever risk was detected with the use of other concomitant drugs, such as olanzapine, lithium or orexin receptor antagonists. Fever onset occurred significantly earlier with faster titration. Multivariate analysis identified obesity as being a factor that accelerated fever onset. CONCLUSION A faster titration speed and concomitant treatment with valproic acid and quetiapine at clozapine initiation increased the risk of clozapine-associated fever. Clinicians should titrate clozapine with caution and consider both the titration speed and concomitant medications.
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Affiliation(s)
- Yuki Kikuchi
- Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan
- Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan
| | - Masahiro Kurosawa
- The Japanese Society of Psychiatric Pharmacy, Tokyo, Japan
- Department of Pharmacy, Showa University Karasuyama Hospital, Tokyo, Japan
| | - Mutsumi Sakata
- The Japanese Society of Psychiatric Pharmacy, Tokyo, Japan
- Nozoe Hills Hospital, Fukuoka, Japan
| | - Yu Takahashi
- The Japanese Society of Psychiatric Pharmacy, Tokyo, Japan
- Department of Pharmaceuticals, Gunma Prefectural Psychiatric Medical Center, Isesaki, Gunma, Japan
| | - Kyohei Yamamoto
- The Japanese Society of Psychiatric Pharmacy, Tokyo, Japan
- Shimane Prefectural Psychiatric Medical Center, Izumo, Shimane, Japan
| | - Hiroaki Tomita
- Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan
| | - Takashi Yoshio
- Sumiyoshi Kaiseikai Sumiyoshi Hospital, Kofu, Yamanashi, Japan
- Psychiatric Clinical Pharmacy Research Group, Tokyo, Japan
| | - Norio Yasui-Furukori
- Department of Psychiatry, Dokkyo Medical University School of Medicine, Mibu, Tochigi, Japan
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Hart XM, Gründer G, Ansermot N, Conca A, Corruble E, Crettol S, Cumming P, Frajerman A, Hefner G, Howes O, Jukic MM, Kim E, Kim S, Maniscalco I, Moriguchi S, Müller DJ, Nakajima S, Osugo M, Paulzen M, Ruhe HG, Scherf-Clavel M, Schoretsanitis G, Serretti A, Spina E, Spigset O, Steimer W, Süzen SH, Uchida H, Unterecker S, Vandenberghe F, Verstuyft C, Zernig G, Hiemke C, Eap CB. Optimisation of pharmacotherapy in psychiatry through therapeutic drug monitoring, molecular brain imaging and pharmacogenetic tests: Focus on antipsychotics. World J Biol Psychiatry 2024; 25:451-536. [PMID: 38913780 DOI: 10.1080/15622975.2024.2366235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 05/12/2024] [Accepted: 06/06/2024] [Indexed: 06/26/2024]
Abstract
BACKGROUND For psychotic disorders (i.e. schizophrenia), pharmacotherapy plays a key role in controlling acute and long-term symptoms. To find the optimal individual dose and dosage strategy, specialised tools are used. Three tools have been proven useful to personalise drug treatments: therapeutic drug monitoring (TDM) of drug levels, pharmacogenetic testing (PG), and molecular neuroimaging. METHODS In these Guidelines, we provide an in-depth review of pharmacokinetics, pharmacodynamics, and pharmacogenetics for 45 antipsychotics. Over 30 international experts in psychiatry selected studies that have measured drug concentrations in the blood (TDM), gene polymorphisms of enzymes involved in drug metabolism, or receptor/transporter occupancies in the brain (positron emission tomography (PET)). RESULTS Study results strongly support the use of TDM and the cytochrome P450 (CYP) genotyping and/or phenotyping to guide drug therapies. Evidence-based target ranges are available for titrating drug doses that are often supported by PET findings. CONCLUSION All three tools discussed in these Guidelines are essential for drug treatment. TDM goes well beyond typical indications such as unclear compliance and polypharmacy. Despite its enormous potential to optimise treatment effects, minimise side effects and ultimately reduce the global burden of diseases, personalised drug treatment has not yet become the standard of care in psychiatry.
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Affiliation(s)
- Xenia Marlene Hart
- Department of Molecular Neuroimaging, Medical Faculty Mannheim, Central Institute of Mental Health, University of Heidelberg, Mannheim, Germany
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
| | - Gerhard Gründer
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
- German Center for Mental Health (DZPG), Partner Site Mannheim, Heidelberg, Germany
| | - Nicolas Ansermot
- Department of Psychiatry, Unit of Pharmacogenetics and Clinical Psychopharmacology, Center for Psychiatric Neuroscience, Lausanne University Hospital, Prilly, Switzerland
| | - Andreas Conca
- Dipartimento di Psichiatria, Comprensorio Sanitario di Bolzano, Bolzano, Italy
| | - Emmanuelle Corruble
- Service Hospitalo-Universitaire de Psychiatrie, Hôpital de Bicêtre, Université Paris-Saclay, AP-HP, Le Kremlin-Bicêtre, France
- Equipe MOODS, Inserm U1018, CESP (Centre de Recherche en Epidémiologie et Sante des Populations), Le Kremlin-Bicêtre, France
| | - Severine Crettol
- Department of Psychiatry, Unit of Pharmacogenetics and Clinical Psychopharmacology, Center for Psychiatric Neuroscience, Lausanne University Hospital, Prilly, Switzerland
| | - Paul Cumming
- Department of Nuclear Medicine, Bern University Hospital, Bern, Switzerland
- School of Psychology and Counseling, Queensland University of Technology, Brisbane, Australia
| | - Ariel Frajerman
- Service Hospitalo-Universitaire de Psychiatrie, Hôpital de Bicêtre, Université Paris-Saclay, AP-HP, Le Kremlin-Bicêtre, France
- Equipe MOODS, Inserm U1018, CESP (Centre de Recherche en Epidémiologie et Sante des Populations), Le Kremlin-Bicêtre, France
| | - Gudrun Hefner
- Forensic Psychiatry, Vitos Clinic for Forensic Psychiatry, Eltville, Germany
| | - Oliver Howes
- Department of Psychosis Studies, IoPPN, King's College London, London, UK
- Faculty of Medicine, Institute of Clinical Sciences (ICS), Imperial College London, London, UK
| | - Marin M Jukic
- Department of Physiology, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
- Pharmacogenetics Section, Department of Physiology and Pharmacology, Karolinska Institutet, Solna, Sweden
| | - Euitae Kim
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seoyoung Kim
- Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Republic of Korea
| | - Ignazio Maniscalco
- Dipartimento di Psichiatria, Comprensorio Sanitario di Bolzano, Bolzano, Italy
| | - Sho Moriguchi
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
| | - Daniel J Müller
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital of Würzburg, Würzburg, Germany
- Pharmacogenetics Research Clinic, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
- Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada
| | - Shinichiro Nakajima
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
| | - Martin Osugo
- Department of Psychosis Studies, IoPPN, King's College London, London, UK
- Faculty of Medicine, Institute of Clinical Sciences (ICS), Imperial College London, London, UK
| | - Michael Paulzen
- Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany
- JARA - Translational Brain Medicine, Alexianer Center for Mental Health, Aachen, Germany
| | - Henricus Gerardus Ruhe
- Department of Psychiatry, Radboudumc, Nijmegen, Netherlands
- Donders Institute for Brain, Cognition and Behavior, Radboud University, Nijmegen, Netherlands
| | - Maike Scherf-Clavel
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital of Würzburg, Würzburg, Germany
| | - Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Zurich, Switzerland
| | | | - Edoardo Spina
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Olav Spigset
- Department of Clinical Pharmacology, St. Olav University Hospital, Trondheim, Norway
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | - Werner Steimer
- Institute of Clinical Chemistry and Pathobiochemistry, Technical University Munich, Munich, Germany
| | - Sinan H Süzen
- Department of Pharmaceutic Toxicology, Faculty of Pharmacy, Ankara University, Ankara, Turkey
| | - Hiroyuki Uchida
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
| | - Stefan Unterecker
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital of Würzburg, Würzburg, Germany
| | - Frederik Vandenberghe
- Department of Psychiatry, Unit of Pharmacogenetics and Clinical Psychopharmacology, Center for Psychiatric Neuroscience, Lausanne University Hospital, Prilly, Switzerland
| | - Celine Verstuyft
- Equipe MOODS, Inserm U1018, CESP (Centre de Recherche en Epidémiologie et Sante des Populations), Le Kremlin-Bicêtre, France
- Department of Molecular Genetics, Pharmacogenetics and Hormonology, Bicêtre University Hospital Paris-Saclay, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Gerald Zernig
- Department of Pharmacology, Medical University Innsbruck, Hall in Tirol, Austria
- Private Practice for Psychotherapy and Court-Certified Witness, Hall in Tirol, Austria
| | - Christoph Hiemke
- Department of Psychiatry and Psychotherapy and Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center of Mainz, Mainz, Germany
| | - Chin B Eap
- Department of Psychiatry, Unit of Pharmacogenetics and Clinical Psychopharmacology, Center for Psychiatric Neuroscience, Lausanne University Hospital, Prilly, Switzerland
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Geneva, Switzerland
- Center for Research and Innovation in Clinical Pharmaceutical Sciences, University of Lausanne, Lausanne, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, University of Lausanne, Lausanne, Switzerland
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Shao L, Li Y, Yuan Z, Guo X, Zeng G, Liu J. The effect of clozapine on immune-related biomarkers in schizophrenia patients. Brain Res Bull 2024; 218:111104. [PMID: 39424000 DOI: 10.1016/j.brainresbull.2024.111104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2024] [Revised: 10/13/2024] [Accepted: 10/16/2024] [Indexed: 10/21/2024]
Abstract
Globally, schizophrenia is one of the main causes of disability. Approximately 1 % of the general population suffers from schizophrenia, and 30 % of cases are unresponsive to therapy. Clozapine is the gold standard for therapy-resistant schizophrenia (TRS), yet it has limited effectiveness and serious adverse events in some patients. Because of the possibility of severe neutropenia, clozapine administration requires monthly hematological monitoring in the first four months. Previous investigations have demonstrated the immune system alteration after clozapine treatment in schizophrenia patients. Besides, it has been proposed that clozapine changes the cytokines profile in schizophrenia patients. These findings highlighted the need to learn more about the disease's etiology and investigate the relationship between peripheral immune system markers and clozapine response to support strategies for better treatment outcomes. The time decision-making to start clozapine could be significantly decreased if some biomarkers were developed to assist physicians in anticipating whether a particular patient will respond to the medication. Therefore, this study aimed to comprehensively review the effect of clozapine on immune-related biomarkers in schizophrenia patients.
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Affiliation(s)
- Lu Shao
- School of Rehabilitation Medicine, Sanquan College of Xinxiang Medical University, XinXiang, HeNan, China.
| | - Yu Li
- School of Rehabilitation Medicine, Sanquan College of Xinxiang Medical University, XinXiang, HeNan, China.
| | - ZhiYao Yuan
- School of Rehabilitation Medicine, Sanquan College of Xinxiang Medical University, XinXiang, HeNan, China.
| | - XiYu Guo
- School of Rehabilitation Medicine, Sanquan College of Xinxiang Medical University, XinXiang, HeNan, China.
| | - GuoJi Zeng
- School of Rehabilitation Medicine, Sanquan College of Xinxiang Medical University, XinXiang, HeNan, China.
| | - JunPeng Liu
- School of Rehabilitation Medicine, Sanquan College of Xinxiang Medical University, XinXiang, HeNan, China.
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Skoble L, Kutz S, Friedman JH. Myocarditis on Clozapine 50 mg/d in a Patient With Parkinson's Disease. J Clin Psychopharmacol 2024:00004714-990000000-00303. [PMID: 39447168 DOI: 10.1097/jcp.0000000000001927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2024]
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Verdoux H, Quiles C, de Leon J. Clozapine for persons with neurodevelopmental disorders: a systematic review and expert recommendations for clinical practice. Expert Rev Clin Pharmacol 2024:1-11. [PMID: 39351707 DOI: 10.1080/17512433.2024.2410395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Accepted: 09/25/2024] [Indexed: 10/04/2024]
Abstract
INTRODUCTION We aimed to synthesize the information on the risks and benefits of clozapine prescription for resistant challenging behavior in persons with neurodevelopmental disorders. METHODS Articles were identified with MEDLINE, Web of Sciences, and PsycINFO search from inception through January 2024. The review was restricted to persons with intellectual disability (ID) and/or autism spectrum disorder (ASD) without comorbid psychotic or affective disorder. Data were synthesized narratively. RESULTS We identified 24 articles (13 case reports, eight chart studies, two controlled studies, one pharmaco-epidemiological study) including 296 patients with ID (n = 222) or ASD (n = 74) (10% aged ≤ 18 years). After clozapine initiation, a decreased frequency of challenging behavior persisting over time was reported in most participants included in clinical studies, and a significant reduction in the number of admissions in the population-based two-year mirror-image study. Adverse drug reactions were those commonly observed with clozapine, i.e. constipation, sedation, and weight gain. CONCLUSIONS Since only four participants were included in the controlled studies, the benefits of clozapine in neurodevelopmental disorders are supported by a body of evidence exclusively drawn from observational studies. Further studies are required to clarify the indications of clozapine with respect to the unmet need induced by resistant challenging behavior. REGISTRATION PROSPERO database registration number CRD42024522343.
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Affiliation(s)
- Hélène Verdoux
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, Team pharmacoepidemiology, Bordeaux, France
| | - Clélia Quiles
- Department of university psychiatry, Centre Hospitalier Charles Perrens, Bordeaux, France
| | - Jose de Leon
- Psychiatry and Neurosciences Research Group (CTS-549), Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
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Grover S, Chaurasia N, Chakrabarti S. Management of tardive dyskinesia and tardive dystonia with clozapine: A retrospective study. Asian J Psychiatr 2024; 102:104245. [PMID: 39288640 DOI: 10.1016/j.ajp.2024.104245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2024] [Revised: 07/27/2024] [Accepted: 09/12/2024] [Indexed: 09/19/2024]
Abstract
AIM This retrospective study aimed to evaluate the long-term effectiveness of switching to clozapine in the management of tardive syndromes (TS). METHODOLOGY The treatment records of patients who had TS at the time of starting clozapine, were reviewed and demographic and clinical data was extracted on a predesigned performa. RESULTS About three-fourth (74.2 %) of the study subjects had tardive dystonias and two-third (69.7 %) had tardive dyskinesia at the time of starting clozapine. About half (48.5 %) of the patients had both tardive dystonia and dyskinesia. A small proportion (13.6 %) also had tardive akathisia at the time of starting clozapine. About three-fourth (72.2 %) of the patients had >50 % reduction, and about two-third (66.6 %) of the patients had >75 % reduction and nearly half (54.5 %) of the patients had complete resolution of dyskinesia at the last follow-up. Similar trends were seen in reduction in dystonia, i.e., >50 % reduction in 74.3 %, >75 % reduction in 62.2 % and complete resolution was seen in 56.1 %. CONCLUSIONS The present study suggest that clozapine is useful in the management of drug induced tardive dyskinesia and tardive dystonia.
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Affiliation(s)
- Sandeep Grover
- Post Graduate Institute of Medical Education & Research, Chandigarh, India.
| | - Nishtha Chaurasia
- Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Subho Chakrabarti
- Post Graduate Institute of Medical Education & Research, Chandigarh, India
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De Las Cuevas C, de Leon VC, Blasco-Fontecilla H, Baca-García E, Sagud M, Sanz EJ, de Leon J. Clozapine may consistently protect from suicidal behaviors while other antipsychotics may lack a specific protective effect: a comprehensive VigiBase study interpreted in the context of the prior literature. Expert Opin Drug Saf 2024:1-11. [PMID: 39223773 DOI: 10.1080/14740338.2024.2399094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2024] [Revised: 08/05/2024] [Accepted: 08/10/2024] [Indexed: 09/04/2024]
Abstract
BACKGROUND In the United States, clozapine was first approved for treatment-resistant schizophrenia and then for suicidality in schizophrenia psychoses. Systematic reviews support clozapine's anti-suicidal effect, but the forensic literature stresses its lethality during overdoses. RESEARCH DESIGN AND METHODS Clozapine reports to the international pharmacovigilance database (VigiBase) were analyzed for suicidal ideation, suicide attempts, intentional overdose, and completed suicides from introduction to 1 January 2024. VigiBase uses the information component (IC) as a disproportionality analysis. RESULTS The clozapine ICs (range: other antipsychotics) were: 1) suicidal ideation IC = 0.570 with IC025 = 0.454 to IC975 = 0.680 (IC = 3.568 for aripiprazole and 1.729 for risperidone), 2) suicide attempt IC = 1.428 with IC025 = 1.323 to IC975 = 1.529 (IC = 4.150 for quetiapine and 2.968 for risperidone), 3) intentional overdose: IC = 0.995 with IC025 = 0.864 to IC975 = 1.120 (IC = 4.080 for quetiapine and 1.957 for aripiprazole), and 4) completed suicide IC = 1.133 with IC025 = 1.026 to IC975 = 1.235 (IC = 4.648 for quetiapine and 2.160 for risperidone). In summary, all clozapine ICs were significantly lower. We found 2391 clozapine-treated patients on the suicidality spectrum (627 cases with suicidal ideation, 752 with suicide attempt, 488 with intentional overdose, and 731 with completed suicide) but many were taking other antipsychotics. The most frequent reporting countries were the United States, the United Kingdom, and Croatia. CONCLUSION This pharmacovigilance study, with all its inherent limitations, provides independent proof, not overlapping with prior literature, that clozapine may have specific strong anti-suicidal effects that do not appear to be present in other antipsychotics. Further VigiBase studies are needed to compare the lethality of an intentional overdose of clozapine (14.3%) with other antipsychotics.
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Affiliation(s)
- Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology, and Psychiatry and Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, La Laguna, Spain
| | - Victoria C de Leon
- Department of Psychiatry, Washington University School of Medicine in St Louis, St Louis, MO, USA
| | - Hilario Blasco-Fontecilla
- Instituto de Investigación, Transferencia e Innovación, Ciencias de la Saludy Escuela de Doctorado, Universidad Internacional de La Rioja, Logroño, Spain
- Emooti, Madrid, Spain
- Center of Biomedical Network Research on Mental Health (CIBERSAM), Carlos III Institute of Health, Madrid, Spain
| | - Enrique Baca-García
- Center of Biomedical Network Research on Mental Health (CIBERSAM), Carlos III Institute of Health, Madrid, Spain
- Department of Psychiatry, Hospital Fundación Jiménez Díaz, Madrid, Spain
- Complutense University of Madrid, Madrid, Spain
- Universidad Católica del Maule, Talca, Chile
- Department of Psychiatry, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
| | - Marina Sagud
- School of Medicine, University of Zagreb, Zagreb, Croatia
- University Hospital Centre Zagreb, Zagreb, Croatia
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, Spain
- Hospital Universitario de Canarias, Tenerife, Spain
| | - Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
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Markota M, Morgan RJ, Leung JG. Updated rationale for the initial antipsychotic selection for patients with schizophrenia. SCHIZOPHRENIA (HEIDELBERG, GERMANY) 2024; 10:74. [PMID: 39223138 PMCID: PMC11369117 DOI: 10.1038/s41537-024-00492-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Accepted: 07/31/2024] [Indexed: 09/04/2024]
Affiliation(s)
- Matej Markota
- Department of Psychiatry & Psychology, Mayo Clinic, 200 First Street SW, Rochester, MN, USA.
| | - Robert J Morgan
- Department of Psychiatry & Psychology, Mayo Clinic, 200 First Street SW, Rochester, MN, USA
| | - Jonathan G Leung
- Department of Psychiatry & Psychology, Mayo Clinic, 200 First Street SW, Rochester, MN, USA
- Department of Pharmacy, Mayo Clinic, 200 First Street SW, Rochester, MN, USA
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12
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Flanagan RJ, Obee SJ, Kim AHM, Every-Palmer S. Plasma Clozapine and N -Desmethylclozapine (Norclozapine) Concentrations and the Clozapine/Norclozapine Ratio : Effect of Dose, Sex, and Cigarette Smoking. J Clin Psychopharmacol 2024; 44:492-501. [PMID: 39173038 DOI: 10.1097/jcp.0000000000001909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/24/2024]
Abstract
BACKGROUND Smoking enhances plasma clozapine clearance, but the magnitude of the effect across the dose and age ranges is unclear. METHODS We audited clozapine dose and predose plasma clozapine and N -desmethylclozapine (norclozapine) concentrations by sex and smoking habit in samples submitted for clozapine TDM, 1996-2017. RESULTS There were 105,316/60,792 and 34,288/31,309 samples from male/female smokers/nonsmokers, respectively. There were distinct dose-median plasma concentration trajectories for male/female smokers/nonsmokers across the range <50 to >850 mg d -1 . For both sexes, the percentage difference in median plasma clozapine in nonsmokers versus smokers averaged 50% but was greatest for men (76%) and women (59%) in the 151 to 250 mg d -1 dose band. In men, the percentage difference declined steadily to 34% at doses of ≥850 mg d -1 . In women, the difference after falling initially remained relatively constant at 40% to 54%. The pattern in median plasma clozapine/norclozapine ratio by plasma clozapine concentration and dose groups was independent of sex and smoking habit, but increased with plasma clozapine concentration (higher ratio at higher concentrations) and also changed with dose. Median plasma clozapine concentration and median clozapine dose by sex and smoking habit were similar up to age 60 years. Proportional weight gain was similar over time in smokers and nonsmokers of either sex. IMPLICATIONS These data explain the variations in the effect size of starting or stopping smoking on plasma clozapine concentration at constant dose reported in different studies. Changes in smoking habit in patients prescribed clozapine require prompt dose adjustment.
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Affiliation(s)
- Robert James Flanagan
- From the Department of Precision Medicine, Networked Services, Bessemer Wing, King's College Hospital NHS Foundation Trust, London, United Kingdom
| | - Stephen John Obee
- From the Department of Precision Medicine, Networked Services, Bessemer Wing, King's College Hospital NHS Foundation Trust, London, United Kingdom
| | - Alice Hyun Min Kim
- Biostatistics Group, Dean's Department, University of Otago, Wellington, Wellington, New Zealand
| | - Susanna Every-Palmer
- Department of Psychological Medicine, University of Otago, Wellington, Wellington, New Zealand
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13
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Qubad M, Dupont G, Hahn M, Martin SS, Puntmann V, Nagel E, Reif A, Bittner RA. When, Why and How to Re-challenge Clozapine in Schizophrenia Following Myocarditis. CNS Drugs 2024; 38:671-696. [PMID: 38951464 PMCID: PMC11316720 DOI: 10.1007/s40263-024-01100-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/03/2024] [Indexed: 07/03/2024]
Abstract
Clozapine-induced myocarditis (CIM) is among the most important adverse events limiting the use of clozapine as the most effective treatment for schizophrenia. CIM necessitates the immediate termination of clozapine, often resulting in its permanent discontinuation with considerable detrimental effects on patients' psychopathology and long-term outcome. Consequently, a clozapine re-challenge after CIM is increasingly regarded as a viable alternative, with published reports indicating a success rate of approximately 60%. However, published cases of re-challenges after CIM remain limited. Here, we provide a narrative review of the current state of research regarding the epidemiology, pathophysiology, risk factors, diagnosis and clinical management of CIM as well as a synthesis of current recommendations for re-challenging patients after CIM. This includes a step-by-step guide for this crucial procedure based on the current evidence regarding the pathophysiology and risk factors for CIM. Slow dose titration regimes and addressing risk factors including concomitant valproate and olanzapine are crucial both to prevent CIM and to ensure a safe and successful re-challenge. Furthermore, we discuss the utility of C-reactive protein, troponin, N-terminal-pro hormone and brain natriuretic peptide, therapeutic drug-monitoring and cardiac magnetic resonance imaging for CIM screening and diagnosis as well as for post-CIM re-challenges.
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Affiliation(s)
- Mishal Qubad
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Goethe University Frankfurt, University Hospital, Frankfurt, Germany.
| | - Gabriele Dupont
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Goethe University Frankfurt, University Hospital, Frankfurt, Germany
| | - Martina Hahn
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Goethe University Frankfurt, University Hospital, Frankfurt, Germany
- Department of Mental Health, Varisano Hospital Frankfurt Hoechst, Frankfurt, Germany
| | - Simon S Martin
- Department of Radiology, Goethe University Frankfurt, University Hospital, Frankfurt, Germany
| | - Valentina Puntmann
- Department of Cardiology, Institute for Experimental and Translational Cardiovascular Imaging, Goethe University Frankfurt, University Hospital, Frankfurt, Germany
| | - Eike Nagel
- Department of Cardiology, Institute for Experimental and Translational Cardiovascular Imaging, Goethe University Frankfurt, University Hospital, Frankfurt, Germany
| | - Andreas Reif
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Goethe University Frankfurt, University Hospital, Frankfurt, Germany
| | - Robert A Bittner
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Goethe University Frankfurt, University Hospital, Frankfurt, Germany.
- Ernst Strüngmann Institute for Neuroscience (ESI) in Cooperation with Max Planck Society, Frankfurt, Germany.
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Shinohara RC, Oshima T, Otsubo T, Ariga K, Ono T, Muneoka K, Umezu H, Mikami N. Successful utilization of clozapine for a patient with treatment-resistant schizophrenia after recurrent violent behavior. Neuropsychopharmacol Rep 2024; 44:599-603. [PMID: 38961521 PMCID: PMC11544433 DOI: 10.1002/npr2.12462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 06/14/2024] [Accepted: 06/15/2024] [Indexed: 07/05/2024] Open
Abstract
BACKGROUND In patients with schizophrenia, violent behavior is a clinically important factor that prevents their discharge. Clozapine is an effective antipsychotic medication for treatment-resistant schizophrenia, and its usefulness for aggressive behavior has also been suggested. CASE PRESENTATION We present the case of a 38-year-old male patient diagnosed with schizophrenia who was successfully treated with clozapine after recurrent violent behavior. He was diagnosed with schizophrenia during his adolescence. He was hospitalized for treatment in his teens, but his hallucinations and delusions persisted even after discharge. In his 30s, he became noticeably emotionally unstable, and despite being treated for an adequate period with sufficient doses of several antipsychotics, his symptoms did not improve. This led to repeated hospitalizations triggered by violent behavior toward his parents and siblings within the home. During his fourth hospitalization, clozapine was initiated due to multiple incidents of violence toward nursing staff secondary to hallucinations and delusions. As the dose of clozapine was gradually increased with therapeutic drug monitoring, the patient's hostility, uncooperativeness, and suspiciousness markedly improved, and his aggressive behavior disappeared. He was discharged to a facility on day 194 after starting clozapine and has continued outpatient visits. CONCLUSION Clozapine was suggested to be effective for aggressive behavior in patients with treatment-resistant schizophrenia and should be actively considered. In such cases, regular measurement of blood concentration is useful for adjusting the dosage of clozapine.
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Affiliation(s)
| | - Tomomi Oshima
- Department of PsychiatryKushiro City General HospitalKushiroJapan
| | - Takafumi Otsubo
- Department of PsychiatryKushiro City General HospitalKushiroJapan
| | - Keita Ariga
- Department of PsychiatryKushiro City General HospitalKushiroJapan
| | - Tesshu Ono
- Department of PsychiatryKushiro City General HospitalKushiroJapan
| | - Koya Muneoka
- Department of PsychiatryKushiro City General HospitalKushiroJapan
| | - Hiroki Umezu
- Department of PsychiatryKushiro City General HospitalKushiroJapan
| | - Nobuhiro Mikami
- Department of PsychiatryKushiro City General HospitalKushiroJapan
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15
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Zang YN, Wan Z, Jia F, Yang Q, Liu CG, Wang Q, Liu SS, Dong F, Li AN, de Leon J, Wang G, Ruan CJ. Population pharmacokinetics of olanzapine in pediatric patients with psychiatric disorders. Expert Opin Drug Metab Toxicol 2024; 20:827-840. [PMID: 39010781 DOI: 10.1080/17425255.2024.2380472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Accepted: 07/04/2024] [Indexed: 07/17/2024]
Abstract
OBJECTIVE To develop and validate a population pharmacokinetic (PPK) model of oral olanzapine in pediatric Chinese patients in order to individualize therapy in this population. METHODS A total of 897 serum concentrations from 269 pediatric patients taking oral olanzapine (ages 8-17 years) were collected. Demographic parameters, biological characteristics and concomitant medications were investigated as covariates. The data were analyzed using a nonlinear mixed-effects modeling approach. Bootstrapping (1000 runs), normalized prediction distribution error (NPDE), and external validation of 62 patients were employed. Simulations were performed to explore the individualized dosing regimens in various situations. RESULTS The one-compartment model with first-order absorption and elimination had an apparent clearance (CL/F) of 10.38 L/h, a distribution volume (V/F) of 9.41 L/kg and an absorption rate constant (Ka) fixed at 0.3 h-1. The equation was CL∕F (L∕h) = 10.38 × (body weight∕60)0.25 ×1.33 (if male) × 0.71 (if co-occurrence of infection) × 0.51 (if co-therapy with fluvoxamine) × 1.27 (if co-therapy with sertraline) × 1.43 (if co-therapy with valproate). The final model had satisfactory stability, robustness, and predictive ability. The results from a simulation suggested the oral olanzapine doses required for male and female pediatric patients weighing between 40 and 60 kg without co-medication were 10-15 mg/day and 7.5-10 mg/day, respectively, and dosage adjustments should be based on sex and body weight; and co-administrated with valproate, sertraline, or fluvoxamine. CONCLUSION This model may help individualize optimum dosing of oral olanzapine for pediatric patients.
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Affiliation(s)
- Yan-Nan Zang
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Zhou Wan
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Fei Jia
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Qi Yang
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Chen-Geng Liu
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Qian Wang
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Shan-Shan Liu
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Fang Dong
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - An-Ning Li
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
| | - Gang Wang
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Can-Jun Ruan
- The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
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16
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Grover S, Sood A, Chakrabarti S. Use of Clozapine in persons with a history of seizures: A retrospective study. Asian J Psychiatr 2024; 98:104144. [PMID: 38955034 DOI: 10.1016/j.ajp.2024.104144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Revised: 05/10/2024] [Accepted: 05/26/2024] [Indexed: 07/04/2024]
Abstract
BACKGROUND Seizures are considered to be one of the dreaded side effects of clozapine, and due to this, the use of clozapine is avoided in patients with treatment-resistant schizophrenia. Resultantly, there is little information about the use of clozapine among patients with seizure disorder. AIM To assess the safety of clozapine in patients with history of seizures in their lifetime before starting clozapine and receiving clozapine for the management of psychotic disorders. RESULTS Out of the 958 patients, 35 (3.65 %) had a history of at least one seizure episode before starting clozapine, with a mean of 5.06 (SD: 7.23; Median: 3.00) seizures before starting clozapine. The mean duration between the last seizure and the starting of clozapine was 123.75 (SD: 124.99; Median: 84) months, with nine patients having an episode of seizure in the previous 12 months and 15 patients being seizure-free for more than ten years. About one-fourth (25.7 %; nine out of 35) of the patients had recurrence of seizure while receiving clozapine for a mean duration of about five years. When the recurrence of seizure after starting clozapine was evaluated in patients receiving antiepileptics along with clozapine, the incidence of at least one seizure was 26.67 % (4 out of 15), and among those not receiving antiepileptics, the incidence of at least one seizure was 25 % (5 out of 20). The dose of clozapine at which seizure was noted ranged from 12.5 mg to 600 mg/day with a mean of 236.25 (SD: 169.04; Median: 162.5) mg/day. In none of the patients, clozapine had to be stopped due to the continuation of seizures. CONCLUSION About one-fourth of the patients with history of an episode of seizure have recurrence of seizure while receiving clozapine. The demographic and clinical variables do not differ between those who develop and who do not develop seizures after starting clozapine, including concomitant use of antiepileptics.
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Affiliation(s)
- Sandeep Grover
- Department of Psychiatry, Postgraduate Institute of Medical Education & Research, Chandigarh 160012, India.
| | - Arshia Sood
- Department of Psychiatry, Postgraduate Institute of Medical Education & Research, Chandigarh 160012, India
| | - Subho Chakrabarti
- Department of Psychiatry, Postgraduate Institute of Medical Education & Research, Chandigarh 160012, India
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Schoretsanitis G, de Leon J, Correll CU. How can we better address the pharmacokinetics of antipsychotics in children and adolescents? Expert Opin Drug Metab Toxicol 2024:1-8. [PMID: 38980734 DOI: 10.1080/17425255.2024.2378887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Accepted: 07/05/2024] [Indexed: 07/11/2024]
Abstract
INTRODUCTION Despite a steady increase of antipsychotic prescriptions in children and adolescents, knowledge about pharmacokinetics and dosing of antipsychotics in children and adolescents remains limited. AREAS COVERED We discuss seven issues with major impact on the pharmacokinetics of antipsychotics in youth: estrogens, ii) obesity, iii) ethnicity, iv) smoking, v) inflammation, vi) drug-drug interactions (DDIs), and vii) pharmacogenetics. Despite their major impact, these issues have not been adequately considered in the context of dosing algorithms for antipsychotics in youth. A simple tool to quantify the impact of these pharmacokinetics issues on antipsychotics is therapeutic drug monitoring (TDM), which refers to the quantification of the prescribed medication in the blood of the patients, as a surrogate for the peripheral antipsychotic exposure. We also provide summary tables extrapolated from the adult literature on metabolism, therapeutic reference ranges (TRRs) and DDIs. EXPERT OPINION Despite considerable experience with TDM for antipsychotics in the management of other patient subgroups, TDM use for antipsychotics in children and adolescents may be limited with TRRs invariably being extrapolated from adult patients. Advancing TDM knowledge is expected to help clinicians address the special properties of pharmacokinetics of antipsychotics and ultimately enable antipsychotic dose individualization in youth.
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Affiliation(s)
- Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Hospital of Psychiatry, University of Zurich, Zurich, Switzerland
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA
- Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
| | - Christoph U Correll
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA
- Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
- The Feinstein Institute for Medical Research, Manhasset, NY, USA
- Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin Berlin, Berlin, Germany
- German Center for Mental Health (DZPG), Berlin, Germany
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18
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de Leon J, Ruan CJ, Schoretsanitis G, Villasante-Tezanos AG, Spina E, Sanz EJ, Betancort M, De Las Cuevas C. Investigating in VigiBase over 6000 cases of pneumonia in clozapine-treated patients in the context of the literature: focus on high lethality and the association with aspiration pneumonia. Expert Opin Drug Metab Toxicol 2024:1-15. [PMID: 38920369 DOI: 10.1080/17425255.2024.2373111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Accepted: 06/15/2024] [Indexed: 06/27/2024]
Abstract
BACKGROUND The literature associates clozapine with pneumonia/aspiration pneumonia. RESEARCH DESIGN AND METHODS The international pharmacovigilance database (VigiBase™) uses the information component (IC) as statistical signal. VigiBase clozapine reports were analyzed for pneumonia/aspiration pneumonia from introduction to 10 May 2023. RESULTS There were 6392 cases of all types of pneumonia (5572 cases of pneumonia, 775 of aspiration pneumonia, and 45 combined). The IC was 3.52 for aspiration pneumonia, introduced as a VigiBase label in 2003, and 1.91 for pneumonia. Patients were reclassified as 3628 with no signs of aspiration and 1533 with signs. Signs of aspiration were strongly associated with some co-medications: olanzapine, odds ratio (OR) = 23.8, 95% confidence interval (CI), 14.9-38.0; risperidone OR = 18.6, CI, 11.4-30.4; valproic acid, OR = 5.5, CI, 4.5-6.6; and benzodiazepines OR = 5.5, CI, 4.5-6.6. In 2415 cases with completed data, fatal outcomes made up 45% (signs of aspiration made no difference), but there was wide variability from 0% (females <45 years of age; duration ≤30 days) to 76% (males >64 years of age; duration >1 year). During the first week, pneumonia was associated with 1) very high titration doses, 2) very small doses in Parkinson's disease, and 3) Japan vs other countries. CONCLUSIONS In clozapine-treated patients: 1) at least 30% of pneumonia cases may be aspiration pneumonia, 2) stopping some co-medications may decrease the risk of aspiration pneumonia, 3) average lethality in pneumonia was 45% but may be around 75% in geriatric patients with long-term treatment, and 4) safer titrations may sometimes require 5-mg tablets.
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Affiliation(s)
- Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
| | - Can-Jun Ruan
- Laboratory of Clinical Psychopharmacology, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA
- Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA
| | | | - Edoardo Spina
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, La Laguna, Canary Islands, Spain
| | - Moisés Betancort
- Department of Clinical Psychology, Psychobiology, and Methodology, Universidad de La Laguna, La Laguna, Canary Islands, Spain
| | - Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry and Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, La Laguna, Canary Islands, Spain
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Agid O, Crespo-Facorro B, de Bartolomeis A, Fagiolini A, Howes OD, Seppälä N, Correll CU. Overcoming the barriers to identifying and managing treatment-resistant schizophrenia and to improving access to clozapine: A narrative review and recommendation for clinical practice. Eur Neuropsychopharmacol 2024; 84:35-47. [PMID: 38657339 DOI: 10.1016/j.euroneuro.2024.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 04/08/2024] [Accepted: 04/10/2024] [Indexed: 04/26/2024]
Abstract
Clozapine is the only approved antipsychotic for treatment-resistant schizophrenia (TRS). Although a large body of evidence supports its efficacy and favorable risk-benefit ratio in individuals who have failed two or more antipsychotics, clozapine remains underused. However, variations in clozapine utilization across geographic and clinical settings suggest that it could be possible to improve its use. In this narrative review and expert opinion, we summarized information available in the literature on the mechanisms of action, effectiveness, and potential adverse events of clozapine. We identified barriers leading to discouragement in clozapine prescription internationally, and we proposed practical solutions to overcome each barrier. One of the main obstacles identified to the use of clozapine is the lack of appropriate training for physicians: we highlighted the need to develop specific professional programs to train clinicians, both practicing and in residency, on the relevance and efficacy of clozapine in TRS treatment, initiation, maintenance, and management of potential adverse events. This approach would facilitate physicians to identify eligible patients and offer clozapine as a treatment option in the early stage of the disease. We also noted that increasing awareness of the benefits of clozapine among healthcare professionals, people with TRS, and their caregivers can help promote the use of clozapine. Educational material, such as leaflets or videos, could be developed and distributed to achieve this goal. The information provided in this article may be useful to improve disease burden and support healthcare professionals, patients, and caregivers navigating the complex pathways to TRS management.
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Affiliation(s)
- Ofer Agid
- Centre for Addiction and Mental Health, University of Toronto, Canada
| | - Benedicto Crespo-Facorro
- Department of Psychiatry, School of Medicine, University Hospital Virgen del Rocío-IBiS-CSIC, Sevilla, Spain, Centro de Investigación Biomédica en Red en Salud Mental (CIBERSAM), Sevilla, Spain
| | - Andrea de Bartolomeis
- University of Naples Federico II, Department of Neuroscience, Reproductive Science, and Odontostomatology. Laboratory of Molecular and Translational Psychiatry. Unit of Treatment Resistant Psychosis, Naples, Italy; Staff Unesco Chair at University of Naples Federico II, Italy
| | | | - Oliver D Howes
- IoPPN, King's College London, De Crespigny Park, London, United Kingdom; Institute of Clinical Sciences (ICS), Faculty of Medicine, Imperial College London, Du Cane Road, London, United Kingdom
| | - Niko Seppälä
- Wellbeing Services in Satakunta, Department of Psychiatry, Pori, Finland and Medical Consultant, Viatris, Finland
| | - Christoph U Correll
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, New York, United States; Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, New York, United States; Charité - Universitätsmedizin Berlin, Department of Child and Adolescent Psychiatry, Augustenburger Platz 1, Berlin 13353, Germany; German Center for Mental Health (DZPG), Partner Site Berlin, Berlin, Germany.
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20
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Schoretsanitis G, Correll CU, Agorastos A, Compaired Sanchez A, Erzin G, Grigoras RM, Grizelj Benussi M, Gondek TM, Guloksuz S, Højlund M, Jerotic S, Kilic O, Metaj E, Sidhu DS, Skandali N, Skuhareuski A, Tveito M, Wolthusen RPF, Chumakov E, de Filippis R. The European psychiatric association (EPA) - early career psychiatrists committee survey on trainees' and early-career psychiatrists' attitudes towards therapeutic drug monitoring (TDM) use and utility during antipsychotic treatment. World J Biol Psychiatry 2024; 25:342-351. [PMID: 38905131 DOI: 10.1080/15622975.2024.2367138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Accepted: 06/07/2024] [Indexed: 06/23/2024]
Abstract
OBJECTIVES This survey assessed psychiatry residents'/early-career psychiatrists' attitudes towards the utility of therapeutic drug monitoring (TDM) of antipsychotics. METHODS A previously developed questionnaire on attitudes on TDM utility during antipsychotic treatment was cross-sectionally disseminated by national coordinators between 01/01/2022-31/12/2023. The frequency of using TDM for antipsychotics other than clozapine was the main outcome in a linear regression analysis, including sex, clinical setting, caseload, and factors generated by an exploratory factor analysis. Comparisons between residents and early-career psychiatrists, respondents working in in- and outpatient settings, and low-/middle- and high-income countries were performed. RESULTS Altogether, 1,237 respondents completed the survey, with 37.9% having never used TDM for antipsychotics. Seven factors explained 41% of response variance; six of them were associated with frequency of TDM use (p < 0.05). Items with highest loadings for factors included clinical benefits of TDM (factors A and E: 0.7), negative expectations for beliefs of patients towards TDM (factor B: 0.6-0.7), weak TDM scientific evidence (factor C: 0.8), and TDM availability (factor D: -0.8). Respondents from low-/middle-income countries were less likely to frequently/almost always use TDM compared to high-income countries (9.4% vs. 21.5%, p < 0.001). DISCUSSION TDM use for antipsychotics was poor and associated with limited knowledge and insufficient availability.
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Affiliation(s)
- Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Hospital of Psychiatry, University of Zurich, Zurich, Switzerland
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA
- Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
| | - Christoph U Correll
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA
- Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
- The Feinstein Institute for Medical Research, Manhasset, NY, USA
- Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Agorastos Agorastos
- II. Department of Psychiatry, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Greece
| | | | - Gamze Erzin
- Department of Psychiatry, Dışkapı Yıldırım Beyazıt Training and Research Hospital, University of Health Sciences, Ankara, Turkey
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Maastricht University Medical Centre, Maastricht, the Netherlands
| | | | | | - Tomasz M Gondek
- Institute of Social Studies, University of Lower Silesia, Wroclaw, Poland
| | - Sinan Guloksuz
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Maastricht University Medical Centre, Maastricht, the Netherlands
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Mikkel Højlund
- Clinical Pharmacology, Pharmacy and Environmental Medicine, Department of Public Health, University of Southern Denmark, Odense, Denmark
- Department of Psychiatry, Mental Health Services Region of Southern Denmark, Aabenraa, Denmark
| | - Stefan Jerotic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
- Clinic for Psychiatry, University Clinical Centre of Serbia, Beograd, Serbia
| | - Ozge Kilic
- Department of Psychiatry, Bezmialem Vakif University Faculty of Medicine, Istanbul, Turkey
| | - Enita Metaj
- Community Mental Health Center no. 2, Tirana, Albania
| | | | - Nikolina Skandali
- Department of Psychiatry, University of Cambridge & Addenbrooke's hospital, Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge, UK
| | | | - Marit Tveito
- Center for Psychopharmacology, Diakonhjemmet hospital, Vinderen, Oslo, Norway
| | - Rick P F Wolthusen
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
| | - Egor Chumakov
- Department of Psychiatry and Addiction, Saint Petersburg State University, Saint Petersburg, Russia
| | - Renato de Filippis
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
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21
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De Las Cuevas C, Sanz EJ, Gross JA, Correll CU, Verdoux H, Lally J, de Filippis R, Schulte PFJ, Molden E, Arrojo-Romero M, Bostrom AD, Schoretsanitis G, Fernandez-Egea E, de Leon J. Revealing the reporting disparity: VigiBase highlights underreporting of clozapine in other Western European countries compared to the UK. Schizophr Res 2024; 268:175-188. [PMID: 38065799 DOI: 10.1016/j.schres.2023.11.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 11/17/2023] [Accepted: 11/22/2023] [Indexed: 06/15/2024]
Abstract
BACKGROUND Pharmacovigilance studies indicate clozapine history is marked by adverse drug reactions (ADRs). OBJECTIVE In a 2021 article, the United Kingdom (UK) had >90 % of European clozapine-related fatal outcomes in VigiBase, the World Health Organization's pharmacovigilance database. Two possibly opposing hypotheses could explain this disparity: 1) fewer reported fatal outcomes in other Western European countries mainly reflect underreporting to VigiBase, and 2) the higher number of UK reports reflects higher real relative mortality. METHODS VigiBase reports from clozapine's introduction to December 31, 2022, were studied for ADRs and the top 10 causes of fatal outcomes. The UK was compared with 11 other top reporting Western countries (Germany, Denmark, France, Finland, Ireland, Italy, Netherlands, Norway, Spain, Sweden and Switzerland). Nine countries (except Ireland and Switzerland) were compared after controlling for population and clozapine prescriptions. RESULTS The UK accounted for 29 % of worldwide clozapine-related fatal outcomes, Germany 2 % and <1 % in each of the other countries. The nonspecific label "death" was the top cause in the world (46 %) and in the UK (33 %). "Pneumonia" was second in the world (8 %), the UK (12 %), Ireland (8 %) and Finland (14 %). Assuming that our corrections for population and clozapine use are correct, other countries underreported only 1-10 % of the UK clozapine fatal outcome number. CONCLUSIONS Different Western European countries consistently underreport to VigiBase compared to the UK, but have different reporting/publishing styles for clozapine-related ADRs/fatal outcomes. Three Scandinavian registries suggest lives are saved as clozapine use increases, but this cannot be studied in pharmacovigilance databases.
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Affiliation(s)
- Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of La Laguna, Canary Islands, Spain; Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain.
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, Canary Islands, Spain; Hospital Universitario de Canarias, Tenerife, Spain
| | | | - Christoph U Correll
- Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany; The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA; Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA.
| | - Hélène Verdoux
- Université Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, Bordeaux, France.
| | - John Lally
- Department of Psychiatry, School of Medicine and Medical Science, University College Dublin, Dublin, Ireland.; Department of Psychiatry, St Vincent's Hospital Fairview, Dublin, Ireland; Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience (IoPPN), King's College London, London, UK.
| | - Renato de Filippis
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Peter F J Schulte
- Mental Health Services Noord-Holland-Noord, Alkmaar, the Netherlands; Dutch Clozapine Collaboration Group, Castricum, the Netherlands.
| | - Espen Molden
- Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway; Department of Pharmacy, University of Oslo, Oslo, Norway.
| | - Manuel Arrojo-Romero
- Department of Psychiatry, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, Spain.
| | - Adrian D Bostrom
- Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Department of Clinical Sciences/Psychiatry, Umeå University, Umeå, Sweden.
| | - Georgios Schoretsanitis
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA; Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA; Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland
| | - Emilio Fernandez-Egea
- Department of Psychiatry, University of Cambridge, Cambridge, UK,; Cambridgeshire and Peterborough NHS Foundation Trust, Fulbourn Hospital, Fulbourn, Cambridge, UK.
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain.
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22
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Baptista T, Motuca M, Serrano A, Perez Lo Presti A, Fernandez-Arana A, Olmos I, Pabon A, Yepez JGA, Alejo Galarza GDJ, Rivera Ramirez NM, Elkis H, Sanz EJ, De Las Cuevas C, de Leon J. An expert review of clozapine in Latin American countries: Use, monitoring, and pharmacovigilance. Schizophr Res 2024; 268:60-65. [PMID: 37985318 DOI: 10.1016/j.schres.2023.10.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 10/22/2023] [Accepted: 10/24/2023] [Indexed: 11/22/2023]
Abstract
There is growing interest in clozapine clinical use, monitoring, and research, particularly adverse drug reactions (ADRs) other than agranulocytosis. In this study we focused on clozapine pharmacovigilance. Hence, we contacted clinicians and researchers in Latin America and requested information about local psychiatric services, clozapine availability, clinical use, and ADR monitoring with the VigiBase system. Only two countries have the minimum recommended number of psychiatric beds (15 per 100,000 residents): Uruguay (N = 34.9) and Argentina (N = 17). Bolivia is the only country where clozapine is unavailable. Nine out of twenty countries (45 %) reported ADRs to VigiBase. Argentina, Brazil, Chile, Colombia, and Mexico published national guidelines for schizophrenia treatment. Chile is the sole country with clozapine clinics with drug serum monitoring. Ethnicity-related drug titration in not described in package inserts in any country. We examined in detail the 9 most frequent and important clozapine ADRs in the worldwide database (pneumonia, sudden death, cardiac arrest, agranulocytosis, myocarditis, constipation, arrhythmia, seizure, and syncope). These 9 ADRs led to 294 reports with fatal outcomes in Argentina (N = 3), Brazil (N = 3), Chile (N = 2), and Peru (N = 1). Agranulocytosis was reported from 7 countries: constipation or seizures from 8 countries. Only two countries reported pneumonia and one country reported myocarditis. The number of clozapine reports in VigiBase has no relationship to the country's population. All Latin American countries underreport clozapine associated ADRs. Latin American governments, along with clinicians, researchers, and educators, should optimize clozapine use and monitoring for the benefit of people with severe mental and some neurological disorders.
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Affiliation(s)
- Trino Baptista
- Department of Physiology, Los Andes University Medical School, Mérida, Venezuela; Medical School, Anáhuac University, Querétaro, Mexico; Neuroorigen, Querétaro, Mexico.
| | - Mariano Motuca
- Department of Psychiatry, School of Medicine at Universidad Nacional de Cuyo, Mendoza, Argentina; Instituto Vilapriño, Centro de Estudios, Asistencia e Investigación en Neurociencias, Mendoza, Argentina
| | - Ana Serrano
- SAMEIN, Salud Mental Integral SAS, Medellin, Colombia
| | | | | | - Ismael Olmos
- Clinical Pharmacology Unit and Pharmacy Department, Vilardebó Hospital, Administración de Servicios de Salud, Montevideo, Uruguay; Clinical Pharmacology Unit and Outpatient Clinic, Vilardebó Hospital, Administración de Servicios de Salud, Montevideo, Uruguay
| | - Albis Pabon
- Los Andes University Hospital, Psychiatric Unit, Merida, Venezuela
| | - Juan Genaro Ayala Yepez
- Posgrado de Psiquiatría, Facultad de Ciencias Médicas de la Universidad Central del Ecuador, Quito, Ecuador; Centro Ambulatorio especializado San Lázaro, Ministerio de Salud Pública, Quito, Ecuador
| | | | | | - Helio Elkis
- Department and Institute of Psychiatry, University of São Paulo Medical School, São Paulo, Brazil
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, Canary Islands, Spain; Hospital Universitario de Canarias, Tenerife, Spain
| | - Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of La Laguna, Canary Islands, Spain; Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
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23
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Verdoux H, Quiles C, de Leon J. Risks and benefits of clozapine and lithium co-prescribing: A systematic review and expert recommendations. Schizophr Res 2024; 268:233-242. [PMID: 37002013 DOI: 10.1016/j.schres.2023.03.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/16/2023] [Accepted: 03/17/2023] [Indexed: 06/19/2023]
Abstract
OBJECTIVES To identify the risks and benefits of clozapine‑lithium co-prescription. METHODS Articles published in English or French were identified with a MEDLINE, Web of Sciences and PsycINFO search, from inception through January 2023, using the term 'clozapine' in combination with 'lithium'. Data were synthesized narratively. RESULTS Of the 67 articles included in the review, more than half (n = 38, 56.7 %) were focused on clozapine-related blood dyscrasia. A body of evidence drawn from case reports and retrospective chart studies highlights the potential benefits of lithium prescription for clozapine-related neutropenia, since this strategy may avoid clozapine discontinuation or allow its rechallenge. The most documented adverse drug reactions (ADRs) associated with clozapine‑lithium co-prescription are neurotoxic events, which may be prevented or detected early by clinical, electroencephalographic and therapeutic drug monitoring. Causality assessment cannot be established for other reported ADRs occurring during clozapine‑lithium co-prescription. The benefits of the combined prescription on psychotic and/or mood symptoms are poorly documented. CONCLUSION The risks and benefits of clozapine‑lithium co-prescription require further exploration as the combination might significantly contribute to reducing underprescription or premature discontinuation of clozapine.
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Affiliation(s)
- Hélène Verdoux
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, team pharmacoepidemiology, UMR 1219, F-33000 Bordeaux, France.
| | - Clélia Quiles
- Centre Hospitalier Charles Perrens, F-33000 Bordeaux, France
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA; Institute of Neurosciences, University of Granada, Granada, Spain; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain; Psychiatry and Neurosciences Research Group (CTS-549), USA
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24
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Carswell O, Wilton LR, Nicholls K, Thomas V, Clark SR. A 12-month audit of clozapine associated myocarditis in a South Australian Local Health Network: The importance of screening and personalised titration. Schizophr Res 2024; 268:88-93. [PMID: 37722933 DOI: 10.1016/j.schres.2023.09.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/04/2023] [Accepted: 09/05/2023] [Indexed: 09/20/2023]
Abstract
Clozapine is effective in up to 50 % of patients resistant to other antipsychotics. Its use is restricted to third-line due to adverse effects which include myocarditis. Australia reports the highest incidence of clozapine-associated myocarditis (CAM) in the context of pharmacovigilance and relatively rapid titration. An audit of patients commenced on clozapine within the Central Adelaide Local Health Network (CALHN) between 2012 and 2015 found an incidence of 8.6 %. We present here a case series from a follow up audit considering titration relevant risk factors for CAM. We reviewed anecdotal cases and data from all hospital-based commencements of clozapine across CALHN for the period July 2021 to June 2022 using pharmacy and medical record databases. We identified 5 cases of CAM and all had risk factors impacting on clozapine metabolism, including rapid titration, elevated baseline CRP, Asian ethnicity and concomitant treatment with inhibitors of clozapine metabolism. While personalisation of clozapine treatment needs further investigation in prospective trials, slower titration to lower targets for risk groups may not impact on hospital length of stay and has the potential to significantly reduce the burden of adverse events. Australian manufacturer approved titration rates exceed those recommended for personalised dosing and may not be safe for patients with risk factors. Early clozapine levels at week two could identify slow metabolisers for dose adjustment. Closer ties between psychiatrists and cardiologists are critical for the development of protocols for safely maintaining clozapine treatment during low level cardiac inflammation and to support safe rechallenge.
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Affiliation(s)
- Olivia Carswell
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Lisa R Wilton
- Office of the Chief Psychiatrist, Adelaide, South Australia, Australia
| | - Kerri Nicholls
- SA Pharmacy, Central Adelaide Local Health Network, Adelaide, South Australia, Australia
| | - Vinod Thomas
- SA Pharmacy, Southern Local Health Network, Bedford Park, South Australia, Australia
| | - Scott R Clark
- University of Adelaide, Discipline of Psychiatry, Adelaide, South Australia, Australia; Basil Hetzel Institute, Woodville, South Australia, Australia; Central Adelaide Local Health Network, Adelaide, South Australia, Australia.
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25
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de Filippis R, De Las Cuevas C, Sanz EJ, Schoretsanitis G, Correll CU, de Leon J. Clozapine-associated pericarditis and pancreatitis in children and adolescents: A systematic literature review and pharmacovigilance study using the VigiBase database. Schizophr Res 2024; 268:118-130. [PMID: 37981478 DOI: 10.1016/j.schres.2023.10.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 10/25/2023] [Accepted: 10/25/2023] [Indexed: 11/21/2023]
Abstract
BACKGROUND The literature has paid very little attention to pericarditis, pericardial effusion and pancreatitis during clozapine treatment in children and adolescents. METHODS Cases of clozapine-associated pericarditis and pancreatitis in children were studied using searches in: 1) PubMed (June 16, 2023), and 2) the World Health Organization's pharmacovigilance database (June 1, 2022), VigiBase. VigiBase uses a logarithmic measure of disproportionality called the information component (IC). RESULTS The PubMed search yielded 3 clozapine-associated pericarditis cases, 1 pancreatitis case and 1 with both. VigiBase provided a significant clozapine-associated pericarditis IC = 3.6 with an IC025 = 2.9 (only 3 cases were expected while 22 were observed). VigiBase provided a significant clozapine-associated pancreatitis IC = 2.2 with an IC025 = 1.4 (only 3 cases were expected while 16 were observed). In VigiBase clozapine-associated pericarditis and pericardial effusion in youth looked similar and on a continuum with myocarditis, as myocarditis, pericarditis and pancreatitis appeared to occur mainly during clozapine titration. Combining PubMed and VigiBase we identified: 1) 29 cases of at least possible clozapine-associated pericarditis/pericardial effusion (6 probable and 23 possible) including 7 cases with and 22 without myocarditis, and 2) 17 cases of clozapine-associated pancreatitis (1 definite and 16 possible). Two of the pancreatitis cases occurred during overdoses. No fatal outcomes were found in any clozapine-associated pericarditis and pancreatitis cases. CONCLUSIONS Despite the lack of attention in the literature to clozapine-associated pericarditis and pancreatitis, results demonstrate that they can happen in youth, particularly during titration. Pericarditis and pancreatitis appear to be forms of clozapine-associated inflammation during dose titration.
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Affiliation(s)
- Renato de Filippis
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy.
| | - Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of La Laguna, Canary Islands, Spain; Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, Canary Islands, Spain; Hospital Universitario de Canarias, Tenerife, Spain
| | - Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland; Department of Psychiatry Research, Zucker Hillside Hospital, Northwell Health, Glen Oaks, New York, USA
| | - Christoph U Correll
- Department of Psychiatry Research, Zucker Hillside Hospital, Northwell Health, Glen Oaks, New York, USA; Department of Psychiatry and Molecular Medicine, The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, New York, NY, USA; Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany.
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain.
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26
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Verdoux H, Quiles C, de Leon J. Optimizing antidepressant and clozapine co-prescription in clinical practice: A systematic review and expert recommendations. Schizophr Res 2024; 268:243-251. [PMID: 37852856 DOI: 10.1016/j.schres.2023.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 10/05/2023] [Accepted: 10/06/2023] [Indexed: 10/20/2023]
Abstract
OBJECTIVES To synthesize the information relevant for clinical practice on clozapine-antidepressant co-prescription concerning pharmacokinetic drug-drug interactions (DDI), adverse drug reactions (ADRs) associated with the co-prescription, antidepressant add-on for clozapine-resistant symptoms and antidepressant add-on for clozapine-induced ADRs. METHODS Articles were identified with MEDLINE, Web of Sciences and PsycINFO search from inception through April 2023. Data were synthesized narratively. RESULTS ADRs are most often induced by the co-prescription of antidepressants that inhibit CYP enzymes (fluvoxamine, fluoxetine, paroxetine). Fluvoxamine add-on is hazardous because of its potent inhibition of clozapine metabolism and has few indications (lowering daily number of clozapine tablets, reducing norclozapine-induced metabolic disturbances and other dose-dependent clozapine-induced ADRs). ADR frequency may be reduced by therapeutic drug monitoring and knowledge of other factors impacting clozapine metabolism (pneumonia, inflammation, smoking, etc.). Improvement of negative symptoms is the most documented beneficial effect of antidepressant add-on for clozapine-resistant psychotic symptoms. The add-on antidepressant should be chosen according to its safety profile regarding DDI with clozapine: antidepressants inhibiting clozapine metabolism or increasing the anticholinergic load should be avoided. Other indications of antidepressant add-on (affective or obsessive compulsive symptoms, sialorrhea, and enuresis) are poorly documented. CONCLUSION Antidepressant add-on to clozapine is associated with potential benefits in clozapine users as this strategy may contribute to reduce the burden of clozapine-resistant symptoms or of clozapine-induced ADRs. Further studies are needed to determine whether antidepressant add-on can reduce the risk of clozapine discontinuation.
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Affiliation(s)
- Hélène Verdoux
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, UMR 1219, F-33000 Bordeaux, France.
| | - Clélia Quiles
- Centre Hospitalier Charles Perrens, F-33000 Bordeaux, France
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, Psychiatry and Neurosciences Research Group (CTS-549), USA; Institute of Neurosciences, University of Granada, Granada, Spain; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
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27
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Lin SK, Lane HY. A brief history of clozapine use in Taiwan. Schizophr Res 2024; 268:34-37. [PMID: 37391310 DOI: 10.1016/j.schres.2023.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 06/13/2023] [Accepted: 06/13/2023] [Indexed: 07/02/2023]
Abstract
Blood concentrations of clozapine in Taiwanese patients appeared approximately 30-50 % higher than that from Caucasian patients, and women possessed a higher blood levels. Fluvoxamine was reported to increase the clozapine levels, reduce clozapine-related weight gain and metabolic disturbances, and improved general psychopathology. Clothiapine, a chemical structure analogue of clozapine, showed potential of benefitting patients who are unsuitable for clozapine treatment in Taiwan. Obsessive/compulsive symptom (OCS) is a common side effect of clozapine. Concentrations of clozapine were remarkably higher in patients with OCS than in those without. In conclusion, clozapine is a widely used in patients with schizophrenia in Taiwan.
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Affiliation(s)
- Shih-Ku Lin
- Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan; Taipei City Hospital and Psychiatric Center, Taipei, Taiwan
| | - Hsien-Yuan Lane
- Department of Psychiatry and Brain Disease Research Center, China Medical University Hospital, Taichung, Taiwan; Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan; Department of Psychology, College of Medical and Health Sciences, Asia University, Taichung, Taiwan.
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Leung JG, Allen ND, Markota M. A case series of clozapine titrations affected by inflammatory processes. Schizophr Res 2024; 268:94-97. [PMID: 37633777 DOI: 10.1016/j.schres.2023.08.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 08/10/2023] [Accepted: 08/12/2023] [Indexed: 08/28/2023]
Affiliation(s)
- Jonathan G Leung
- Department of Pharmacy, Mayo Clinic Rochester, MN, United States of America.
| | - Nicholas D Allen
- Department of Psychiatry and Psychology, Mayo Clinic Rochester, MN, United States of America
| | - Matej Markota
- Department of Psychiatry and Psychology, Mayo Clinic Rochester, MN, United States of America
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Kitagawa K, Uekusa S, Hanai Y, Kimura I, Tsukahara M, Kagawa A, Sasaoka K, Sakishiro Y, Miyake A, Watanabe Y, Baba D, Kodama M, Kishi Y, Yamada N, Yoshio T, Matsuo K. Changes in psychopharmacotherapy for patients with schizophrenia in a psychiatric institution in Japan: A 12-year prescription survey pre- and post-introduction of clozapine. Asian J Psychiatr 2024; 96:104047. [PMID: 38640549 DOI: 10.1016/j.ajp.2024.104047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 04/03/2024] [Accepted: 04/07/2024] [Indexed: 04/21/2024]
Abstract
Psychopharmacotherapy for patients with schizophrenia in Japan has a long history of polypharmacy, which is rare worldwide but remains a critical problem. One reason for this is that clozapine was not available in Japan until 2009. We aimed to investigate the changes in psychopharmacotherapy in patients with schizophrenia over 12 years pre- and post-introduction of clozapine to clarify how psychopharmacotherapy for patients with schizophrenia has changed with the introduction of clozapine. We retrospectively collected data from the medical records of inpatients diagnosed with schizophrenia at the Okayama Psychiatric Medical Center. Chlorpromazine equivalent (CP-eq) decreased from 1276.6 mg/day in 2009 to 613.9 mg/day in 2020. The prescribed daily dose/defined daily dose (PDD/DDD) decreased from 3.0 in 2009 to 1.2 in 2020. The monotherapy rate increased from 24.4 % in 2009 to 74.6 % in 2020. Our institution began using clozapine in 2010, and the prescription rate for clozapine increased to 37.3 % in 2020. The prescription rate for more than three antipsychotics decreased from 27.8 % in 2009 to 0.8 % in 2020. The increase in clozapine prescription has contributed to an increased rate of antipsychotic monotherapy and a decreased rate of polypharmacy, promoting the optimization of schizophrenia medication. Clozapine therapy should be further promoted in Japan to reduce treatment-resistant schizophrenia due to polypharmacy as much as possible.
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Affiliation(s)
- Kohei Kitagawa
- Department of Clinical Research, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Shusuke Uekusa
- Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Japan.
| | - Yuki Hanai
- Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Japan
| | - Itsuki Kimura
- Department of Pharmacy, Toho University Omori Medical Center, Ota, Japan
| | - Masaru Tsukahara
- Department of Neuropsychiatry, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Azusa Kagawa
- Department of Pharmacy, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Kenji Sasaoka
- Department of Pharmacy, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Yui Sakishiro
- Department of Pharmacy, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Ayaka Miyake
- Department of Pharmacy, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Yuki Watanabe
- Department of Pharmacy, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Daiki Baba
- Department of Pharmacy, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Masafumi Kodama
- Department of Clinical Research, Okayama Psychiatric Medical Center, Okayama, Japan; Department of Neuropsychiatry, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Yoshiki Kishi
- Department of Neuropsychiatry, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Norihito Yamada
- Department of Neuropsychiatry, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Takashi Yoshio
- Sumiyoshikaiseikai Sumiyoshi Hospital Yamanashi, Japan; Department of Hospital Pharmaceutics, Faculty of Pharmaceutical Sciences, Showa University, Shinagawa, Japan
| | - Kazuhiro Matsuo
- Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Japan
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Clark SR, Wilton LR, Dawson JL, Chiew K, Jawahar MC, Toben C, Pukala T, Ajaero C, Saleem M. Dotting the I's and crossing the T's: A South Australian perspective on variability in troponin thresholds for myocarditis risk in clozapine treatment. Schizophr Res 2024; 268:114-117. [PMID: 37516549 DOI: 10.1016/j.schres.2023.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 07/08/2023] [Accepted: 07/09/2023] [Indexed: 07/31/2023]
Affiliation(s)
- Scott R Clark
- University of Adelaide, Discipline of Psychiatry, Adelaide, South Australia, Australia; Basil Hetzel Institute, Woodville, South Australia, Australia; Central Adelaide Local Health Network, Adelaide, South Australia, Australia.
| | - Lisa R Wilton
- Office of the Chief Psychiatrist, Adelaide, South Australia, Australia
| | - Jessica L Dawson
- Centre for Medicine Use and Safety, Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia; SA Pharmacy, Southern Adelaide Local Health Network, Bedford Park, South Australia, Australia
| | - Kim Chiew
- Central Adelaide Local Health Network, Adelaide, South Australia, Australia
| | - M Catharine Jawahar
- University of Adelaide, Discipline of Psychiatry, Adelaide, South Australia, Australia
| | - Catherine Toben
- University of Adelaide, Discipline of Psychiatry, Adelaide, South Australia, Australia
| | - Tara Pukala
- Department of Chemistry, School of Physical Sciences, University of Adelaide, Adelaide, South Australia, Australia
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31
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Baptista T, Serrano A, Presti APL, Fernandez-Arana A, Elkis H, Motuca M, Olmos I, Schoretsanitis G. Clozapine safety monitoring and related research in psychiatry and neurology in South America: A scoping review. Schizophr Res 2024; 268:29-33. [PMID: 37541864 DOI: 10.1016/j.schres.2023.07.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/20/2023] [Accepted: 07/21/2023] [Indexed: 08/06/2023]
Abstract
The quality and quantity of clozapine safety monitoring considerably differs among South American countries and mainly focus on hematological surveillance. Few studies have been conducted on other clozapine-related adverse effects (ADRs) and mainly refer to case reports and literature reviews. We retrieved thirty-nine publications on clozapine related ADRs others than neutropenia. Studies in Brazil and Venezuela accounted for 67 % of all the publications, and 8 out of 12 countries published 2 or less manuscripts. Only Chile offers serum clozapine level measurement in public institutions. Given the recently recognized role of ethnicity, gender, smoking, obesity drug interactions in optimal clozapine administration, modernization of clozapine clinical use and research in psychiatry and neurology most be broadcasted and stimulated in South American countries.
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Affiliation(s)
- Trino Baptista
- Department of Physiology, Los Andes University Medical School, Mérida, Venezuela; Medical School, Anáhuac University, Querétaro, Mexico; Neuroorigen, Querétaro, Mexico.
| | - Ana Serrano
- SAMEIN, Salud Mental Integral SAS, Medellin, Colombia.
| | | | | | - Helio Elkis
- Department and Institute of Psychiatry, University of São Paulo Medical School, São Paulo, Brazil.
| | - Mariano Motuca
- Department of Psychiatry, School of Medicine at Universidad Nacional de Cuyo, Mendoza, Argentina; Instituto Vilapriño, Centro de Estudios, Asistencia e Investigación en Neurociencias, Mendoza, Argentina.
| | - Ismael Olmos
- Clinical Pharmacology Unit and Pharmacy Department, Vilardebó Hospital, Administración de Servicios de Salud, Montevideo, Uruguay; Clinical Pharmacology Unit and Outpatient Clinic, Vilardebó Hospital, Administración de Servicios de Salud, Montevideo, Uruguay.
| | - Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland; The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, NY, USA; Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA.
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Faden J, Citrome L. A systematic review of clozapine for aggression and violence in patients with schizophrenia or schizoaffective disorder. Schizophr Res 2024; 268:265-281. [PMID: 38290941 DOI: 10.1016/j.schres.2023.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 10/26/2023] [Accepted: 11/19/2023] [Indexed: 02/01/2024]
Abstract
Although uncommon, the risk of aggression and violence is greater in people with schizophrenia than in the general population. Clozapine is the "gold standard" pharmacologic treatment for the management of persistent agitation and aggression in people with schizophrenia and is consistently recommended by guidelines and reviews for this purpose. Although clozapine is indicated for treatment-resistant schizophrenia based on its superior efficacy, studies have proposed that clozapine may have specific properties that ameliorate aggression and hostility that are distinct from its antipsychotic effects. A literature review was conducted on June 3, 2023, using the US National Library of Medicine's PubMed resource to identify articles focusing on clozapine for the treatment of aggression, violence, and/or hostility in patients with schizophrenia or schizoaffective disorder. The majority of evidence, including from randomized control trials, supports the utilization of clozapine as maintenance treatment for persistent aggressive behavior in patients with schizophrenia, and supports that its anti-aggressive effects may be independent from its antipsychotic properties (e.g. - treatment of hallucinations and delusions). Future randomized control studies evaluating clozapine and clozapine serum levels with aggression as the primary outcome would be of benefit.
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Affiliation(s)
- Justin Faden
- Lewis Katz School of Medicine at Temple University, Philadelphia, PA, United States of America.
| | - Leslie Citrome
- New York Medical College, Valhalla, NY, United States of America
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Kang N, Kim SH, Kim J, Kim S, Jang J, Yoon H, Lee J, Kim M, Kim YS, Kwon JS. Association between initial clozapine titration and pneumonia risk among patients with schizophrenia in a Korean tertiary hospital. Schizophr Res 2024; 268:107-113. [PMID: 37770376 DOI: 10.1016/j.schres.2023.09.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 09/14/2023] [Accepted: 09/15/2023] [Indexed: 09/30/2023]
Abstract
Pneumonia is a significant adverse drug reaction (ADR) associated with clozapine, characterized by high mortality and potential linkage with other inflammatory responses. Despite the critical nature, research regarding the development of pneumonia during initial clozapine titration remains limited. This retrospective study included 1408 Korean inpatients with schizophrenia spectrum disorders. Data were collected from January 2000 to January 2023. Pneumonia developed in 3.5 % of patients within 8 weeks of clozapine initiation. Patients who developed pneumonia were taking a greater number and higher dose of antipsychotics at baseline (2.14 vs. 1.58, p < 0.001; 25.64 vs. 19.34, p = 0.012). The average onset occurred 17.24 days after initiation, on an average dose of 151.28 mg/day. Titration was either paused or slowed in most of these patients, with no reported fatalities. The types of pneumonia included aspiration pneumonia, mycoplasma pneumonia, bronchopneumonia, and COVID-19 pneumonia. Myocarditis, drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome, and urinary tract infections were also identified. Logistic regression analysis revealed that a greater number of concomitant antipsychotics (odds ratio [OR] = 1.59, p = 0.027) and concomitant benzodiazepine use (OR = 2.33, p = 0.005) at baseline were associated with an increased risk of pneumonia. Overall, pneumonia development during clozapine titration is linked with other inflammatory ADRs, suggesting a shared immunological mechanism. Close monitoring is recommended, especially for patients taking multiple antipsychotics and benzodiazepines. Further studies involving repeated measures of clozapine concentrations at trough and steady state, along with a more detailed description of pneumonia types, are warranted.
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Affiliation(s)
- Nuree Kang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Se Hyun Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Jayoun Kim
- Medical Research Collaborating Center, Seoul National University Hospital, Seoul, Republic of Korea
| | - Sungkyu Kim
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jinhyeok Jang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Heesoo Yoon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jeonghoon Lee
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Minah Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yong Sik Kim
- Department of Psychiatry, Nowon Eulji Medical Center, Eulji University, Seoul, Republic of Korea
| | - Jun Soo Kwon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Republic of Korea; Institute of Human Behavioral Medicine, SNU-MRC, Seoul, Republic of Korea
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34
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Schulte PFJ. Can clozapine be used for treatment-refractory behavioral and psychological symptoms in dementia patients? Schizophr Res 2024; 268:285-288. [PMID: 37479589 DOI: 10.1016/j.schres.2023.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 07/08/2023] [Accepted: 07/09/2023] [Indexed: 07/23/2023]
Affiliation(s)
- Peter F J Schulte
- Mental Health Services Noord-Holland-Noord, Alkmaar, the Netherlands.
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35
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Nuebel M, Leung JG, Hughes C, McGrane I. Evaluation of major adverse events of clozapine based on accordance to an international titration guideline. Ment Health Clin 2024; 14:204-211. [PMID: 38835819 PMCID: PMC11147652 DOI: 10.9740/mhc.2024.06.204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 01/02/2024] [Indexed: 06/06/2024] Open
Abstract
Introduction Clozapine is the only antipsychotic approved for treatment-resistant schizophrenia, but without appropriate monitoring, it can be associated with potentially fatal outcomes. An International Adult Clozapine Titration Guideline categorizes patients into normal or slow metabolizers. Categorization provides clozapine titration schedules and recommends regular c-reactive protein (CRP) and clozapine concentration monitoring to reduce the risk of adverse drug reactions (ADRs). The impact of the guideline on clozapine ADRs has not been evaluated. Methods A retrospective chart review assessed clozapine titrations, laboratory monitoring, ADRs, and discontinuations for clozapine-naive adult inpatients at a single center from January 1, 2013, to June 1, 2022. Each patient's cumulative weekly clozapine dosage was compared with their guideline recommended dosage to create a percent accordance. Linear logistic regression evaluated the relationship between titration speed and the presence of an ADR, while descriptive statistics analyzed laboratory monitoring. Results Forty-three patients were included, with the majority being White males with schizophrenia. An inverse relationship existed between the last inpatient week clozapine dose percent accordance and the probability of an ADR. Nonobese patients were less likely than obese patients to experience an ADR (odds ratio = 0.17; 95% CI, 0.03-0.99). CRP and clozapine concentration monitoring was suboptimal. Discussion Based on our small retrospective review of primarily White males, more aggressive clozapine titrations did not increase ADRs. Future studies with more diverse samples are needed and should focus on specific ADRs, which may have increased occurrence with rapid titrations. Obese patients were at higher risk of ADRs, correlating with the guideline-recommended slower titrations for these patients.
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Affiliation(s)
- Matthew Nuebel
- (Corresponding author) Post Graduate Year One Pharmacy Resident, Department of Pharmacy, Providence St. Patrick Hospital, Missoula, Montana,
| | - Jonathan G. Leung
- Psychiatric Pharmacist, Department of Pharmacy, Mayo Clinic, Rochester, Minnesota
| | | | - Ian McGrane
- Associate Professor, Skaggs School of Pharmacy, University of Montana, Missoula, Montana
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Ruan CJ, Olmos I, Ricciardi C, Schoretsanitis G, Vincent PD, Anıl Yağcıoğlu AE, Eap CB, Baptista T, Clark SR, Fernandez-Egea E, Kim SH, Lane HY, Leung J, Maroñas Amigo O, Motuca M, Every-Palmer S, Procyshyn RM, Rohde C, Suhas S, Schulte PFJ, Spina E, Takeuchi H, Verdoux H, Correll CU, Molden E, De Las Cuevas C, de Leon J. Exploring low clozapine C/D ratios, inverted clozapine-norclozapine ratios and undetectable concentrations as measures of non-adherence in clozapine patients: A literature review and a case series of 17 patients from 3 studies. Schizophr Res 2024; 268:293-301. [PMID: 37487869 DOI: 10.1016/j.schres.2023.07.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/07/2023] [Accepted: 07/08/2023] [Indexed: 07/26/2023]
Abstract
BACKGROUND Up to 1/2 of outpatients prescribed clozapine may be partially/fully non-adherent, based on therapeutic drug monitoring (TDM). Three indices for measuring partial/full non-adherence are proposed a: 1) clozapine concentration/dose (C/D) ratio which drops to half or more of what is expected in the patient; 2) clozapine/norclozapine ratio that becomes inverted; and 3) clozapine concentration that becomes non-detectable. METHODS These 3 proposed indices are based on a literature review and 17 cases of possible non-adherence from 3 samples: 1) an inpatient study in a Chinese hospital, 2) an inpatient randomized clinical trial in a United States hospital, and 3) and a Uruguayan outpatient study. RESULTS The first index of non-adherence is a clozapine C/D ratio which is less than half the ratio corresponding to the patient's specific ancestry group and sex-smoking subgroup. Knowing the minimum therapeutic dose of the patient based on repeated TDM makes it much easier to establish non-adherence. The second index is inverted clozapine/norclozapine ratios in the absence of alternative explanations. The third index is undetectable concentrations. By using half-lives, the chronology of the 3 indices of non-adherence was modeled in two patients: 1) the clozapine C/D ratio dropped to ≥1/2 of what is expected from the patient (around day 2); 2) the clozapine/norclozapine ratio became inverted (around day 3); and 3) the clozapine concentration became undetectable by the laboratory (around days 9-11). CONCLUSION Prospective studies should further explore these proposed clozapine indices in average patients, poor metabolizers (3 presented) and ultrarapid metabolizers (2 presented).
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Affiliation(s)
- Can-Jun Ruan
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| | - Ismael Olmos
- Clinical Pharmacology Unit and Pharmacy Department, Vilardebó Hospital, Administración de Servicios de Salud, Montevideo, Uruguay.
| | - Carina Ricciardi
- Clinical Pharmacology Unit and Outpatient Clinic, Vilardebó Hospital, Administración de Servicios de Salud, Montevideo, Uruguay.
| | - Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland; The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, New York, USA; Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA.
| | - Philippe D Vincent
- Department of Pharmacy, Institut Universitaire en Santé Mentale de Montréal (IUSMM), Montreal, Canada; Faculty of Pharmacy, Université de Montréal, Montreal, Canada; IUSMM Research Center, Montreal, Canada.
| | | | - Chin B Eap
- Unit of Pharmacogenetics and Clinical Psychopharmacology, Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland; School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland; Center for Research and Innovation in Clinical Pharmaceutical Sciences, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland; Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, University of Lausanne, Geneva, Switzerland.
| | - Trino Baptista
- Department of Physiology, Los Andes University Medical School, Mérida, Venezuela; Medical School, Anáhuac University, Querétaro, Mexico; Neuroorigen, Querétaro, Mexico.
| | - Scott R Clark
- University of Adelaide, Discipline of Psychiatry, Adelaide, Australia.
| | - Emilio Fernandez-Egea
- Department of Psychiatry, University of Cambridge, Cambridge, UK; Cambridgeshire and Peterborough NHS Foundation Trust, Fulbourn Hospital, Fulbourn, Cambridge, UK.
| | - Se Hyun Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Hsien-Yuan Lane
- Department of Psychiatry and Brain Disease Research Center, China Medical University Hospital, Taichung, Taiwan; Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan; Department of Psychology, College of Medical and Health Sciences, Asia University, Taichung, Taiwan.
| | - Jonathan Leung
- Department of Pharmacy, Mayo Clinic, Rochester, MN, USA.
| | - Olalla Maroñas Amigo
- Genomic Medicine Group, Galician Public Foundation of Genomic Medicine (FPGMX), Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Galicia, Spain; Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain; Center for Biomedical Research in Rare Diseases Network, Carlos III Health Institute, Madrid, Spain.
| | - Mariano Motuca
- Department of Psychiatry, School of Medicine at Universidad Nacional de Cuyo, Mendoza, Argentina.
| | - Susanna Every-Palmer
- Department of Psychological Medicine, University of Otago Wellington, Wellington, New Zealand.
| | - Ric M Procyshyn
- Department of Psychiatry, University of British Columbia, Vancouver, Canada; British Columbia Mental Health and Substance Use Services Research Institute, Vancouver, Canada.
| | - Christopher Rohde
- Department of Affective Disorders, Aarhus University Hospital - Psychiatry, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
| | - Satish Suhas
- Department of Psychiatry, National Institute of Mental Health and Neurosciences [NIMHANS], Bangalore, India.
| | - Peter F J Schulte
- Mental Health Services Noord-Holland-Noord, Alkmaar, Netherlands; Dutch Clozapine Collaboration Group, Castricum, Netherlands.
| | - Edoardo Spina
- Department of Clinical and Experimeta Medicine, University of Messina, Messina, Italy.
| | - Hiroyoshi Takeuchi
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan.
| | - Hélène Verdoux
- Université Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, UMR 1219, F-33000 Bordeaux, France.
| | - Christoph U Correll
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, New York, USA; Department of Psychiatry, Zucker School of Medicine at Northwell/Hofstra, Hempstead, NY, USA; Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany.
| | - Espen Molden
- Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway; Department of Pharmacy, University of Oslo, Oslo, Norway.
| | - Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of La Laguna, Canary Islands, Spain; Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain.
| | - Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain.
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Cheuk NKW, Tse W, Tsui HKH, Ma CF, Chun JSW, Chung AKK, Chan SKW. A systematic review and meta-analysis of the effect of clozapine on cognitive functions in patients with treatment-resistant schizophrenia. Schizophr Res 2024; 268:205-222. [PMID: 37788946 DOI: 10.1016/j.schres.2023.09.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/09/2023] [Accepted: 09/14/2023] [Indexed: 10/05/2023]
Abstract
BACKGROUND This study aimed to conduct a systematic review and meta-analysis on cognitive performances of patients with treatment-resistant schizophrenia (TRS) after clozapine treatment and to examine the potential effect of follow-up duration and clozapine dosage. METHODS Five electronic databases were searched and studies were included if treatment-resistant schizophrenia patients were treated with clozapine and with baseline and follow-up cognitive functions assessments. Cognitive measures were categorised into six domains based on DSM-5-TR. Random-effect model analysis was used to pool the effect estimates. Moderator effects of clozapine dosage, follow up duration, duration of illness, age, years of education and change in positive symptoms severity were examined with meta-regression. FINDINGS Nineteen articles were included with 50 cognitive measures reported. Systematic review found inconsistent results. Twelve cognitive measures were included for meta-analysis and found overall improvement of cognitive performances after clozapine treatment SMD = 0.11 [95 % CI 0.02, 0.20] (p = 0.021). Patients with younger age, more years of education and improvements in positive symptoms are more likely to improve in cognitive performances. Subgroup analysis found significant improvement in studies with follow-up periods of 6-months or longer but not for studies with shorter follow-up periods. CONCLUSION Clozapine may improve some domains of cognitive function, particularly over a longer period. However, the overall inconsistent results suggest that more studies with larger sample size and standard cognitive function assessments would be needed to enhance our understanding of the impact of clozapine on the cognitive functions in the TRS patients.
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Affiliation(s)
- Natalie Kwok Wing Cheuk
- Department of Psychiatry, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, China
| | - Wing Tse
- Department of Psychiatry, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, China
| | - Harry Kam Hung Tsui
- Department of Psychiatry, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, China
| | - Chak Fai Ma
- Department of Psychiatry, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, China; School of Nursing, The Hong Kong Polytechnic University, China
| | - Johnny Siu Wah Chun
- Department of Psychiatry, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, China
| | - Albert Kar Kin Chung
- Department of Psychiatry, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, China
| | - Sherry Kit Wa Chan
- Department of Psychiatry, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, China; The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, China.
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Kang N, Kim SH, Kim J, Kim S, Jang J, Yoon H, Lee J, Kim M, Kim YS, Kwon JS. Association between initial pattern of clozapine titration, concentration-to-dose ratio, and incidence of fever in patients with schizophrenia spectrum disorders in a Korean tertiary hospital. Schizophr Res 2024; 268:131-137. [PMID: 37633775 DOI: 10.1016/j.schres.2023.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/01/2023] [Accepted: 08/04/2023] [Indexed: 08/28/2023]
Abstract
Safe and effective administration of clozapine requires careful monitoring for inflammatory reactions during the initial titration. The concentration-to-dose (C/D) ratio must be taken into account, which may vary among ethnicities. In this retrospective study, 1408 Korean schizophrenia inpatients were examined for during the first 8 weeks of clozapine titration. The average doses of clozapine administered during weeks 1, 2, 4, and 8 were 77.37, 137.73, 193.20, and 212.83 mg/day, with significantly lower doses for females than males. The average C/D ratio was significantly higher in females (1.75 ± 1.04 and 1.11 ± 0.67 ng/mL per mg/day). Patients with higher C/D ratios were more likely to experience fever and were prescribed lower doses of clozapine starting from week 4. In total, 22.1 % of patients developed a fever at an average of 15.74 days after initiating clozapine. Patients who developed a fever were younger, used more antipsychotics at baseline, had a higher C/D ratio, and had a higher incidence of an elevated C-reactive protein level. A higher C/D ratio, use of a greater number of antipsychotics at baseline, and concomitant olanzapine use were risk factors for the development of inflammatory reactions. The incidence of pneumonia, agranulocytosis, and myocarditis within 8 weeks were 3.7 %, 0.3 %, and 0.1 %. In summary, the target dose of clozapine titration is lower for Korean schizophrenia patients, with a higher C/D ratio and more frequent fever compared to Western patients; however, myocarditis occurs rarely. Our findings may contribute to the titration methods for clozapine for the East Asian population.
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Affiliation(s)
- Nuree Kang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Se Hyun Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Jayoun Kim
- Medical Research Collaborating Center, Seoul National University Hospital, Seoul, Republic of Korea.
| | - Sungkyu Kim
- Biomedical research institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jinhyeok Jang
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Heesoo Yoon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Junhee Lee
- Department of Psychiatry, Uijeongbu Eulji Medical Center, Uijeongbu, Republic of Korea
| | - Minah Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yong Sik Kim
- Department of Psychiatry, Nowon Eulji Medical Center, Eulji University, Seoul, Republic of Korea
| | - Jun Soo Kwon
- Department of Psychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Republic of Korea; Institute of Human Behavioral Medicine, SNU-MRC, Seoul, Republic of Korea
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Kikuchi Y, Komatsu H, Otsuka Y, Ito F, Kanahara N, Tanifuji H, Tomita H. Slower clozapine titration than the official Japanese protocol led to fewer inflammatory adverse effects: A retrospective chart review of seven hospitals. Schizophr Res 2024; 268:98-106. [PMID: 37331881 DOI: 10.1016/j.schres.2023.06.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/06/2023] [Accepted: 06/08/2023] [Indexed: 06/20/2023]
Abstract
BACKGROUND Higher frequencies of inflammatory adverse effects of clozapine have been reported in Japan. As the international titration protocol for Asians has set slower dose titration than the Japanese package insert, we hypothesized that a dose titration speed slower than the recommendation of the guideline would be associated with fewer inflammatory-related adverse events. METHODS The medical records of all 272 patients who were first started on clozapine at seven hospitals between 2009 and 2023 were studied retrospectively. Of those, 241 were included in the analysis. The patients were divided into two groups regarding whether the titration speed was faster or slower than the guideline for Asians. The incidence of inflammatory adverse events with clozapine was compared between the groups. RESULTS The frequency of inflammatory adverse events was 34 % (37/110) in the faster titration group and 13 % (17/131) in the slower titration group, and a significant difference was observed by Fisher exact test (odds ratio 3.38; 95 % confidence interval 1.71-6.91; p < 0.001). Serious adverse effects, fever for more than five days, and clozapine discontinuation were significantly more frequent in the faster titration group. Logistic regression analysis indicated significantly more inflammatory adverse events in the faster titration group (adjusted odds ratio 4.01; 95 % confidence interval 2.02-7.87; p < 0.001) considering age, sex, body mass index, concomitant valproic acid, and smoking as confounding factors. CONCLUSION Clozapine-induced inflammatory adverse events were less frequent in Japanese individuals when a titration rate was more gradual than the protocol recommended in the Japanese package insert.
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Affiliation(s)
- Yuki Kikuchi
- Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan; Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan.
| | - Hiroshi Komatsu
- Department of Psychiatry, Tohoku University Hospital, Sendai, Miyagi, Japan
| | - Yuji Otsuka
- Department of Psychiatry, Asahi General Hospital, Asahi, Japan.
| | - Fumiaki Ito
- National Hospital Organization Hanamaki Hospital, Hanamaki, Japan
| | - Nobuhisa Kanahara
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan; Division of Medical Treatment and Rehabilitation, Center for Forensic Mental Health, Chiba University, Chiba, Japan.
| | - Hiroaki Tanifuji
- Department of Pharmacy, Kodama Hospital, Ishinomaki, Miyagi, Japan.
| | - Hiroaki Tomita
- Department of Psychiatry, Graduate School of Medicine, Tohoku University, Sendai, Miyagi, Japan; Department of Psychiatry, Tohoku University Hospital, Sendai, Miyagi, Japan.
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De Las Cuevas C, Sanz EJ, de Leon J. Adverse drug reactions and their fatal outcomes in clozapine patients in VigiBase: Comparing the top four reporting countries (US, UK, Canada and Australia). Schizophr Res 2024; 268:165-174. [PMID: 37301669 DOI: 10.1016/j.schres.2023.05.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 05/03/2023] [Accepted: 05/04/2023] [Indexed: 06/12/2023]
Abstract
BACKGROUND Pharmacovigilance findings and box warnings in the clozapine package inserts have marked the history of clozapine. OBJECTIVE This is the largest review of clozapine adverse drug reactions (ADRs) and their associated fatal outcomes. Reports to the World Health Organization's global pharmacovigilance database, VigiBase™, were analyzed, extending from clozapine's introduction to December 31, 2022. METHODS The analysis focused on the top four reporting countries: United States (US), United Kingdom (UK), Canada and Australia (83 % of fatal outcomes worldwide). Attempts were made to control for population and clozapine prescription in each country. RESULTS Clozapine ADRs worldwide accounted for 191,557 reports, with the highest number (53,505) in "blood and lymphatic system disorder". Of the 22,596 fatal outcomes reported in clozapine patients, 9587 were from the US, 6567 from the UK, 3623 from Canada and 1484 from Australia. The top category worldwide in fatal outcomes was nonspecifically labeled "death" with 46 % (range 22-62 %). "Pneumonia" was second with 30 % (range 17-45 %). Agranulocytosis was numerically only the 35th top clozapine ADR associated with fatal outcomes. On average, 2.3 clozapine ADRs were reported per fatal outcome. Infections were associated with 24.2 % of the UK fatal outcomes (9.4 %-11.9 % in the 3 other countries). CONCLUSIONS The four countries appeared to report clozapine ADRs in different ways, making comparisons difficult. We estimated higher fatal outcomes in the UK and Canada after controlling for cross-sectional estimations of population and published clozapine use. This last hypothesis is limited by the lack of precise estimation of accumulated clozapine use in each country.
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Affiliation(s)
- Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of La Laguna, Canary Islands, Spain; Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain.
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, Canary Islands, Spain; Hospital Universitario de Canarias, Tenerife, Spain
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain.
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de Leon J, Wang L, Simpson GM. The introduction of clozapine at the Nathan Kline Institute in New York and its long-term consequences. Schizophr Res 2024; 268:14-20. [PMID: 37689508 DOI: 10.1016/j.schres.2023.08.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 08/20/2023] [Accepted: 08/21/2023] [Indexed: 09/11/2023]
Abstract
Nathan S. Kline was a pioneer in psychopharmacology in the United States (US). In 1952, Kline started a research unit at Rockland State Hospital, New York. Kline brought clozapine from Switzerland since it was not yet available in the US. At Rockland State Hospital, George Simpson had conducted antipsychotic trials and had developed scales to assess movement disorders. In 1974, Simpson published the first US clozapine trial. In 1978, he published on 1) the effect of clozapine on tardive dyskinesia and 2) high plasma clozapine concentrations in two patients with seizures. His experience of clozapine withdrawal symptoms in his first 2 trials led in the future to more articles in this area. In Philadelphia, Simpson designed a double-blind randomized clinical trial (RCT) with 3 doses (100, 300 and 600 mg/day) which was published in 1999. From the 50 patients started on the RCT, 47 provided repeated plasma clozapine concentrations every other week of the RCT. This rich database of plasma clozapine concentrations under controlled conditions has contributed to many of the advances in clozapine pharmacokinetics in the last 5 years including: 1) obesity can be associated with clozapine poor metabolism (PM) status, 2) a clozapine ultrarapid metabolizer (UM) with a minimum therapeutic dose of 1591 mg/day, 3) a case of clozapine intoxication dropped from the RCT due to pneumonia, 4) cases of increased plasma concentrations during clozapine-induced fever, 5) the possibility that African-Americans may need higher clozapine doses than those of European ancestry, and 6) three indices of non-adherence.
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Affiliation(s)
- Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain.
| | - Linda Wang
- Department of Psychiatry, University of Southern California, Los Angeles, CA, United States of America
| | - George M Simpson
- Department of Psychiatry, University of Southern California, Los Angeles, CA, United States of America.
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Jia F, Zang YN, Ruan CJ, Chi L, Zhuang HY, Wan Z, Yang Q, de Leon J. A Chinese medicine called Danggui Longhui may be a new clinically relevant clozapine inducer: Two case reports identified by therapeutic drug monitoring. Schizophr Res 2024; 268:308-311. [PMID: 37775404 DOI: 10.1016/j.schres.2023.09.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 09/12/2023] [Accepted: 09/14/2023] [Indexed: 10/01/2023]
Abstract
BACKGROUND Danggui Longhui is a traditional Chinese medicine made from the dried root of Angelica sinensis. It is used in psychiatric patients in China to reduce associated constipation. In a population pharmacokinetic model in olanzapine patients from Beijing Anding Hospital, we demonstrate that dangguilonghui tablets doubled olanzapine clearance, indicating the induction of olanzapine metabolism. Olanzapine metabolism is similar to clozapine metabolism. METHODS Two cases of possible clozapine induction using dangguilonghui tablets 4 g/day were identified in Beijing Anding Hospital. Dividing the minimum therapeutic concentration of 350 ng/mL by the concentration-to-dose (C/D) ratio provides the minimum therapeutic dose. RESULTS Case 1 was a female smoker on clozapine for 415 days. The mean of 6 clozapine C/D ratios associated with smoking provided a minimum therapeutic dose of 267 mg/day. There were 6 steady-state concentrations on the combination of valproic acid and dangguilonghui tablets, which provided a much higher minimum therapeutic dose of 833 mg/day. Four steady-state clozapine C/D ratios based on smoking and valproate after 4 months of carbamazepine 200 mg/day provided a minimum therapeutic dose of 603 mg/day. Case 2 was a female non-smoker on clozapine for 58 days. She had 3 clozapine C/D ratios on dangguilonghui tablets with a mean of 0.30 ng/mL providing a minimum therapeutic dose of 1167 mg/day. CONCLUSION Future clinical studies with repeated measures need to replicate the possibility that dangguilonghui tablets are a moderate-to-strong inducer of clozapine metabolism as suggested by these two limited cases.
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Affiliation(s)
- Fei Jia
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China.
| | - Yan-Nan Zang
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Can-Jun Ruan
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China.
| | - Li Chi
- School of Traditional Chinese Medicine, Capital Medical University, Beijing, China.
| | - Hong-Yan Zhuang
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Zhou Wan
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Qi Yang
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain.
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43
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Ruan CJ, Wang CY, Zang YN, Liu CG, Dong F, Li AN, Wan Z, Guo W, Wang G. A brief history of clozapine in China with a look forward. Schizophr Res 2024; 268:25-28. [PMID: 37236890 DOI: 10.1016/j.schres.2023.03.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/29/2023] [Accepted: 03/30/2023] [Indexed: 05/28/2023]
Abstract
Clozapine was first manufactured in China in 1976. Clozapine is currently used not only for treatment-refractory schizophrenia (TRS), but also continues to be used in the treatment of patients with non-TRS and other mental disorders; moreover, low-dose clozapine is also used in sedative-hypnotic therapy and in combination with other drugs. There is need for studies in China using various titrations and assessing their risk for myocarditis and aspiration pneumonia. The Chinese clozapine package insert will also greatly benefit from these changes.
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Affiliation(s)
- Can-Jun Ruan
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| | - Chuan-Yue Wang
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| | - Yan-Nan Zang
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Chen-Geng Liu
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Fang Dong
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - An-Ning Li
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Zhou Wan
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Wei Guo
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Gang Wang
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
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Kane JM, Schoretsanitis G, Rubio JM, Correll CU. Clozapine in treatment-resistant schizophrenia: Reflections from the Hallmark US clinical trial and beyond. Schizophr Res 2024; 268:9-13. [PMID: 38290942 DOI: 10.1016/j.schres.2024.01.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 02/01/2024]
Affiliation(s)
- John M Kane
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA
| | - Georgios Schoretsanitis
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA; Department of Psychiatry, Psychotherapy and Psychosomatics, Hospital of Psychiatry, University of Zurich, Zurich, Switzerland.
| | - Jose M Rubio
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA
| | - Christoph U Correll
- The Zucker Hillside Hospital, Department of Psychiatry, Northwell Health, Glen Oaks, NY, USA; The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, NY, USA; The Feinstein Institute for Medical Research, Center for Psychiatric Neuroscience, Manhasset, NY, USA; Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany; German Center for Mental Health (DZPG), partner site Berlin, Germany
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45
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Yang Z, Takeuchi H, Yee JY, See YM, Tang C, Ng BT, Lee J. Once-daily versus divided dosing regimens of clozapine: A cross-sectional study in Singapore. Schizophr Res 2024; 268:66-73. [PMID: 37833207 DOI: 10.1016/j.schres.2023.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 09/12/2023] [Accepted: 10/02/2023] [Indexed: 10/15/2023]
Abstract
INTRODUCTION Clozapine is recognized as the gold standard medication for treatment-resistant schizophrenia. Despite the general recommendation of administering in a divided dosing regimen, clozapine is often prescribed once daily at night in clinical practice. This study aims to compare patient characteristics, psychiatric symptoms, side effects, and plasma concentration of clozapine between once-daily dosing and divided dosing regimens. METHODS This cross-sectional study included 159 participants with treatment-resistant schizophrenia or schizoaffective disorder. Participant's demographic information, anthropometric data, and medical history were collected. Their psychiatric symptoms, cognition, functioning, and side effects were evaluated. RESULTS Once-daily dosing regimen was associated with younger age and competitive employment. Lower clinical symptom severity, better functioning and cognitive performance were observed in the once-daily dosing group. Lower daily dose of clozapine, trough plasma concentrations of clozapine and norclozapine were also significantly associated with once-daily dosing regimen. CONCLUSION The study results support once-daily dosing of clozapine as a viable option to selected patients in clinical practice, as no association of severe symptoms or side effects were associated with once-daily dosing regimen. More studies are needed to examine the relationship between clinical outcomes and clozapine dosing regimen.
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Affiliation(s)
- Zixu Yang
- Research Division, Institute of Mental Health, Singapore
| | - Hiroyoshi Takeuchi
- Department of Neuropsychiatry, Keio University School of Medicine, Japan
| | - Jie Yin Yee
- Research Division, Institute of Mental Health, Singapore
| | - Yuen Mei See
- Research Division, Institute of Mental Health, Singapore
| | - Charmaine Tang
- Department of Psychosis, Institute of Mental Health, Singapore
| | - Boon Tat Ng
- Department of Pharmacy, Institute of Mental Health, Singapore
| | - Jimmy Lee
- Department of Psychosis, Institute of Mental Health, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore.
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Sagud M, Breznoscakova D, Celofiga A, Chihai J, Chkonia E, Ristic Ignjatovic D, Injac Stevovic L, Kopecek M, Kurvits K, Kuzo N, Lazáry J, Mazaliauskienė R, Mladina Perisa D, Novotni A, Panov G, Pikirenia U, Rădulescu FȘ, Sukiasyan SG, Taube M, Tomori S, Wilkowska A, De Las Cuevas C, Sanz EJ, de Leon J. An expert review of clozapine in Eastern European countries: Use, regulations and pharmacovigilance. Schizophr Res 2024; 268:53-59. [PMID: 37783650 DOI: 10.1016/j.schres.2023.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 09/02/2023] [Accepted: 09/04/2023] [Indexed: 10/04/2023]
Abstract
OBJECTIVES To compare the prevalence, regulations, and pharmacovigilance practices of clozapine use in Eastern European countries (except Russia). METHODS Questionnaires and data from administrative databases (2016 and 2021), package inserts and national guidelines were collected from 21 co-authors from 21 countries. Reports of clozapine adverse drug reactions (ADRs) sent to the global pharmacovigilance database (VigiBase™) were analyzed from introduction to December 31, 2022. RESULTS Clozapine prescription among antipsychotics in 2021 varied six-fold across countries, from 2.8 % in the Czech Republic to 15.8 % in Montenegro. The utilization of antipsychotics in both 2016 and 2021 was highest in Croatia, and lowest in Serbia in 2016, and Montenegro in 2021, which had half the defined daily dose (DDD)/1000/day compared to the Croatian data. From 2016 to 2021, the prevalence of antipsychotic use increased in almost all countries; the proportion of clozapine use mainly remained unchanged. Differences were detected in hematological monitoring requirements and clozapine approved indications. Only a few national schizophrenia guidelines mention clozapine-induced myocarditis or individual titration schemes. The VigiBase search indicated major underreporting regarding clozapine and its fatal outcomes. By comparison, the United Kingdom had less than half the population of these Eastern European countries but reported to VigiBase more clozapine ADRs by 89-fold and clozapine fatal outcomes by almost 300-fold. CONCLUSION Clozapine is under-utilized in Eastern European countries. Introducing individualized clozapine treatment schedules may help to maximize clozapine benefits and safety. Major improvement is needed in reporting clozapine ADRs and fatal outcomes in Eastern European countries.
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Affiliation(s)
- Marina Sagud
- School of Medicine, University of Zagreb, Zagreb, Croatia; University Hospital Centre Zagreb, Zagreb, Croatia.
| | - Dagmar Breznoscakova
- Department of Social and Behavioural Medicine, Faculty of Medicine, Pavol Jozef Safarik University, Kosice, Slovakia.
| | - Andreja Celofiga
- Department of Psychiatry, University Medical Centre, Maribor, Maribor, Slovenia.
| | - Jana Chihai
- State University of Medicine and Pharmacy Nicolae Testemitanu, Chişinău, Republic of Moldova.
| | - Eka Chkonia
- Tbilisi State Medical University, Department of Psychiatry, Tbilisi, Georgia.
| | - Dragana Ristic Ignjatovic
- University of Kragujevac, Faculty of Medical Sciences, Department of Psychiatry, Kragujevac, Serbia.
| | - Lidija Injac Stevovic
- Medical Faculty, University of Montenegro, Psychiatric Clinic, Clinical Centre of Montenegro, Podgorica, Montenegro.
| | - Miloslav Kopecek
- National Institute of Mental Health, Klecany, Czech Republic; Department of Psychiatry, Charles University, Third Faculty of Medicine, Prague, Czech Republic.
| | - Katrin Kurvits
- Bureau of Pharmacovigilance, Department of Post-authorisation Safety, State Agency of Medicines, Estonia.
| | - Nazar Kuzo
- Department of Psychiatry, Psychotherapy and Psychosomatics, Hospital of Psychiatry, University of Zurich, Zurich, Switzerland.
| | - Judit Lazáry
- National Institute of Mental Health, Neurology and Neurosurgery, Budapest, Hungary.
| | - Ramunė Mazaliauskienė
- Psychiatric Clinic, Lithuanian Health Sciences University Kaunas Hospital, Lithuanian Health Sciences University, Kaunas, Lithuania.
| | - Djurdjica Mladina Perisa
- County Hospital "Dr. Fra Mihovil Sučić" Livno, Svetog Ive 2, Livno 80101, Bosnia and Herzegovina.
| | - Antoni Novotni
- University Clinic of Psychiatry Medical Faculty, University Ss. Cyril and Methodius-Skopje, North Macedonia.
| | - Georgi Panov
- Psychiatric Clinic, University Hospital "Prof Dr Stoyan Kirkovich" Trakia University, Stara Zagora, Bulgaria.
| | - Uladzimir Pikirenia
- Department of Psychiatry and Medical Psychology, Belarusian State Medical University, Minsk, Belarus.
| | - Flavian Ștefan Rădulescu
- Center for Drug Sciences, Faculty of Pharmacy, University of Medicine and Pharmacy Carol Davila, Bucharest, Romania.
| | - Samvel Grant Sukiasyan
- Psychiatric Services of Center of Psychosocial Recovery, Yerevan, Armenia; Department of Applied Psychology of the Armenian State Pedagogical University named after Kh. Abovyan, Yerevan, Armenia.
| | - Māris Taube
- Department of Psychiatry and Narcology, Riga Stradinš University, Riga, Latvia; Department for Depression and Crisis, Riga Center of Psychiatry and Narcology, Riga, Latvia.
| | - Sonila Tomori
- University Hospital Center "Mother Teresa", Tirana, Albania.
| | - Alina Wilkowska
- Department of Psychiatry, Medical University of Gdańsk, Gdańsk, Poland.
| | - Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of La Laguna, Canary Islands, Spain; Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, San Cristóbal de La Laguna, Spain.
| | - Emilio J Sanz
- Department of Physical Medicine and Pharmacology, School of Medicine, Universidad de La Laguna, Canary Islands, Spain; Hospital Universitario de Canarias, Tenerife, Spain.
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY, United States of America; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain.
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Kirilochev O, Chumakov E, Kuzo N, Schoretsanitis G. A scoping review of literature on clozapine from former USSR states published in Russian language. Schizophr Res 2024; 268:38-47. [PMID: 37741739 DOI: 10.1016/j.schres.2023.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 09/06/2023] [Accepted: 09/07/2023] [Indexed: 09/25/2023]
Abstract
OBJECTIVE Access to literature on clozapine in Russian language remains strikingly limited. We aimed to identify and translate clinical evidence on clozapine-based treatment outcomes. METHODS We performed a systematic review in PubMed, Embase and scientific indexes from former USSR states searching for articles published in Russian from the database inception till January 2023 and summarized the data in a scoping review (PROSPERO Reg. Number CRD42023386737). RESULTS A total of 60 papers were included comprising eight main topic categories: 1) clozapine-related intoxications (n = 20), 2) effectiveness/efficacy and safety of clozapine treatment (n = 14), 3) adverse drug-induced reactions (ADRs) related to clozapine treatment (n = 9), 4) therapeutic drug monitoring for clozapine (n = 5), 5) combination of clozapine and non-pharmacological treatments (n = 4), 6) pharmacoepidemiology of clozapine (n = 3), 7) effects of clozapine on the brain electrical activity (n = 3), and 8) novel clozapine formulations (n = 2). Among clozapine-related intoxications there were reports of criminal poisoning, which was associated with low lethality. Worse outcomes were accompanied by systemic reactions to intoxications. Clinical benefits of hemoadsorption were reported in the management of clozapine-related intoxications. Only half of studies reporting clozapine effectiveness used standardized scales to assess outcomes. Clozapine superiority in treatment-resistant schizophrenia (TRS) was replicated in one trial. No reports of clozapine-related agranulocytosis were identified. Clozapine ranked among most prescribed antipsychotics for TRS and non-TRS. CONCLUSIONS As clinical research in former USSR states is advancing to adopt western clinical research standards, comparability and extrapolation of findings is expected to increase, with transfer of older findings to clinical practice being particularly challenging.
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Affiliation(s)
- Oleg Kirilochev
- Department of Clinical Pharmacology, Astrakhan State Medical University, Astrakhan, Russian Federation.
| | - Egor Chumakov
- Department of Psychiatry and Addiction, Saint-Petersburg State University, Saint-Petersburg, Russian Federation
| | - Nazar Kuzo
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatry University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatry University Hospital Zurich, University of Zurich, Zurich, Switzerland; Department of Psychiatry, The Zucker Hillside Hospital, Northwell Health, Glen Oaks, NY, USA; Department of Psychiatry and Molecular Medicine, Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA
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48
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Schoretsanitis G, Anıl Yağcıoğlu AE, Ruan CJ, Eap CB, Molden E, Baptista T, Clark SR, Fernandez-Egea E, Kim SH, Lane HY, Leung J, Maroñas Amigo O, Motuca M, Olmos I, Every-Palmer S, Procyshyn RM, Rohde C, Satish S, Schulte PFJ, Spina E, Takeuchi H, Verdoux H, Correll CU, de Leon J. Clozapine ultrarapid metabolism during weak induction probably exists but requires careful diagnosis. A literature review, five new cases and a proposed definition. Schizophr Res 2024; 268:302-307. [PMID: 37268453 DOI: 10.1016/j.schres.2023.05.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 05/08/2023] [Accepted: 05/09/2023] [Indexed: 06/04/2023]
Abstract
During weak induction (from smoking and/or valproate co-prescription), clozapine ultrarapid metabolizers (UMs) need very high daily doses to reach the minimum therapeutic concentration of 350 ng/ml in plasma; clozapine UMs need clozapine doses higher than: 1) 900 mg/day in patients of European/African ancestry, or 2) 600 mg/day in those of Asian ancestry. Published clozapine UMs include 10 males of European/African ancestry, mainly assessed with single concentrations. Five new clozapine UMs (two of European and three of Asian ancestry) with repeated assessments are described. A US double-blind randomized trial included a 32-year-old male smoking two packages/day with a minimum therapeutic dose of 1,591 mg/day from a single TDM during open treatment of 900 mg/day. In a Turkish inpatient study, a 30-year-old male smoker was a possible clozapine UM needing a minimum therapeutic dose of 1,029 mg/day estimated from two trough steady-state concentrations on 600 mg/day. In a Chinese study, three possible clozapine UMs (all male smokers) were identified. The clozapine minimum therapeutic dose estimated with trough steady-state concentrations >150 ng/ml was: 1) 625 mg/day, based on a mean of 20 concentrations in Case 3; 2) 673 mg/day, based on a mean of 4 concentrations in Case 4; and 3) 648 mg/day, based on a mean of 11 concentrations in Case 5. Based on these limited studies, clozapine UMs during weak induction may account for 1-2% of clozapine-treated patients of European ancestry and <1% of those of Asian ancestry. A clozapine-to-norclozapine ratio <0.5 should not be used to identify clozapine UMs.
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Affiliation(s)
- Georgios Schoretsanitis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland; Division of Psychiatry Research, Northwell Health, The Zucker Hillside Hospital, New York, NY, USA; Department of Psychiatry and Molecular Medicine, The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, New York, NY, USA.
| | | | - Can-Jun Ruan
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China.
| | - Chin B Eap
- Unit of Pharmacogenetics and Clinical Psychopharmacology, Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland; School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland; Center for Research and Innovation in Clinical Pharmaceutical Sciences, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland; Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, University of Lausanne, Geneva, Switzerland.
| | - Espen Molden
- Center for Psychopharmacology, Diakonhjemmet Hospital, PO Box 23 Vinderen, 0319 Oslo, Norway; Department of Pharmacy, University of Oslo, Oslo, Norway.
| | - Trino Baptista
- Department of Physiology, Los Andes University Medical School, Mérida, Venezuela; Medical School, Anáhuac University, Querétaro, Mexico; Neuroorigen, Querétaro, Mexico
| | - Scott R Clark
- University of Adelaide, Discipline of Psychiatry, Adelaide, Australia.
| | - Emilio Fernandez-Egea
- Department of Psychiatry, University of Cambridge, Cambridge, UK; Cambridgeshire and Peterborough NHS Foundation Trust, Fulbourn Hospital, Fulbourn, Cambridge, UK.
| | - Se Hyun Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Hsien-Yuan Lane
- Department of Psychiatry and Brain Disease Research Center, China Medical University Hospital, Taichung, Taiwan; Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan; Department of Psychology, College of Medical and Health Sciences, Asia University, Taichung, Taiwan
| | - Jonathan Leung
- Department of Pharmacy, Mayo Clinic, Rochester, MN, USA.
| | - Olalla Maroñas Amigo
- Genomic Medicine Group, Galician Public Foundation of Genomic Medicine (FPGMX), Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Galicia, Spain; Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain; Center for Biomedical Research in Rare Diseases Network, Carlos III Health Institute, Madrid, Spain.
| | - Mariano Motuca
- Department of Psychiatry, School of Medicine at Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Ismael Olmos
- Clinical Pharmacology Unit, Pharmacy Department, Vilardebó Hospital, Administración de Servicios de Salud (ASSE), Montevideo, Uruguay.
| | - Susanna Every-Palmer
- Department of Psychological Medicine, University of Otago Wellington, Wellington, New Zealand.
| | - Ric M Procyshyn
- Department of Psychiatry, University of British Columbia, Vancouver, Canada; British Columbia Mental Health and Substance Use Services Research Institute, Vancouver, Canada.
| | - Christopher Rohde
- Department of Affective Disorders, Aarhus University Hospital - Psychiatry, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Suhas Satish
- Department of Psychiatry, National Institute of Mental Health and Neurosciences [NIMHANS], Bangalore, India
| | - Peter F J Schulte
- Mental Health Services Noord-Holland-Noord, Alkmaar, Netherlands; Dutch Clozapine Collaboration Group, Castricum, Netherlands.
| | - Edoardo Spina
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy.
| | - Hiroyoshi Takeuchi
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan.
| | - Hélène Verdoux
- Université Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, UMR 1219, F-33000 Bordeaux, France.
| | - Christoph U Correll
- Division of Psychiatry Research, Northwell Health, The Zucker Hillside Hospital, New York, NY, USA; Department of Psychiatry and Molecular Medicine, The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, New York, NY, USA; Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany.
| | - Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA; Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain.
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49
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Sankaranarayanan A, Kazi S, Andrade C. Prevalence and predictors of QTc prolongation in patients seen in a clozapine clinic in a real-world setting in Australia. Schizophr Res 2024; 268:145-149. [PMID: 37770378 DOI: 10.1016/j.schres.2023.09.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 09/19/2023] [Accepted: 09/20/2023] [Indexed: 09/30/2023]
Abstract
BACKGROUND Many antipsychotic drugs have been associated with QTc prolongation, which is a risk factor for sudden death. We studied the prevalence and predictors of QTc prolongation in treatment-resistant schizophrenia patients who were receiving clozapine in a real-world setting. METHODS Data were extracted from the records of all schizophrenia patients aged 18-65 years, enrolled in a clozapine clinic in metropolitan Australia during October 2020 to April 2022, for whom ECG data were available. RESULTS There were 104 eligible patients. The mean age of the sample was 42 years. The sample was 56 % male. About a third of patients were receiving antipsychotic and antidepressant drugs in addition to clozapine. The mean (standard deviation) QTc was 437.0 (24.8) ms in men and 445.8 (28.5) ms in women. QTc prolongation was present in 36.5 % of the sample. In univariate analysis, higher heart rate and higher clozapine levels were significantly associated with QTc prolongation; in multivariable logistic regression analysis, nonsignificant statistical trends were observed for male sex, higher heart rate, and higher serum clozapine level. CONCLUSIONS QTc prolongation may be common in schizophrenia patients who receive clozapine in real world settings; this is a matter of much concern. Potential predictors of QTc prolongation need to be identified and these predictors and their interactions require to be explored in studies with greater statistical power.
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Affiliation(s)
- Anoop Sankaranarayanan
- Blacktown Mental Health Service, Western Sydney LHD Mental Health Service, Blacktown Hospital, Blacktown, NSW 2148, Australia; Translational Health Research Unit and School of Medicine, Blacktown Clinical School, Western Sydney University, Blacktown Hospital, Blacktown, NSW 2148, Australia.
| | - Sharmin Kazi
- Blacktown Mental Health Service, Western Sydney LHD Mental Health Service, Blacktown Hospital, Blacktown, NSW 2148, Australia.
| | - Chittaranjan Andrade
- Department of Clinical Psychopharmacology and Neurotoxicology, National Institute of Mental Health and Neurosciences, Bangalore 560 029, India.
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50
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Rafizadeh R, Sooch A, Risi A, Bihelek N, Kanegawa K, Barr AM, White RF, Schütz CG, Bousman CA. Impact of patient-specific factors on clozapine metabolism in individuals with treatment-resistant schizophrenia or schizoaffective disorder. J Psychopharmacol 2024; 38:526-531. [PMID: 38520287 PMCID: PMC11179308 DOI: 10.1177/02698811241241394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/25/2024]
Abstract
BACKGROUND There is high inter-individual variability in clozapine metabolism due to genetic and non-genetic differences. Patient-specific factors such as smoking, inflammation indicated by elevated C-reactive protein (CRP), and certain concurrent medications have a significant influence on clozapine metabolism. AIM To assess which patient-specific factors best explain variability in clozapine metabolism estimated by clozapine concentration to dose (C/D) ratios. METHODS A retrospective cohort analysis using electronic medical data was conducted on 172 inpatients at the BC Psychosis Program. Patients with normal renal and liver function were included if they were on clozapine and had at least one steady-state plasma concentration. The degree of influence of each factor on the variability of clozapine metabolism in the entire cohort and subgroups stratified by fluvoxamine use was evaluated using multiple linear regression analysis of C/D ratios. RESULTS Model fit testing showed that the entire cohort model accounts for 52.7% of C/D ratio variability, while the no fluvoxamine and fluvoxamine models accounted for 40.8% and 43.8%. In the entire cohort (n = 172), fluvoxamine use explained the highest variance, and C/D ratios were higher by 30.6% on average. The second strongest predictor was elevated CRP > 10 mg/L, and C/D ratios were higher by 22.9% on average. Subsequently, obesity, nonsmoker status, and female sex explained a significant but modest proportion of variance. Among participants on fluvoxamine (n = 58), only fluvoxamine dose was associated with an increase, and for every 25 mg increase in dose, C/D ratios increased by 5% on average. CONCLUSION In a clinical population, this study replicated the relationship between reduced rate of clozapine metabolism and the use of fluvoxamine, elevated CRP, obesity, nonsmoking status, and female sex; and the magnitude of the effects were large enough to be clinically relevant.
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Affiliation(s)
- Reza Rafizadeh
- Department of Experimental Medicine, University of British Columbia, Vancouver, BC, Canada
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
- BC Mental Health and Substance Use Services, Vancouver, BC, Canada
- BC Psychosis Program, UBC Hospital, Vancouver, BC, Canada
- Lower Mainland Pharmacy Services, Vancouver, BC, Canada
| | - Anmol Sooch
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Alessia Risi
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Nicoline Bihelek
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Kyler Kanegawa
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Alasdair M Barr
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, Vancouver, BC, Canada
| | - Randall F White
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
- BC Psychosis Program, UBC Hospital, Vancouver, BC, Canada
| | - Christian G Schütz
- Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
- BC Mental Health and Substance Use Services, Vancouver, BC, Canada
| | - Chad A Bousman
- Departments of Medical Genetics, Psychiatry, Physiology & Pharmacology, and Community Health Sciences, University of Calgary, Calgary, AB, Canada
- Mathison Centre for Mental Health Research & Education, Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
- Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, AB, Canada
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