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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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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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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 2024:1-7. [PMID: 39104017 DOI: 10.1192/bjp.2024.113] [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: 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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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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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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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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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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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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9
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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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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: 9] [Impact Index Per Article: 9.0] [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 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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de Leon J. Promoting safer and wider worldwide use of clozapine. Schizophr Res 2024; 268:1-6. [PMID: 38519290 DOI: 10.1016/j.schres.2024.03.003] [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: 03/08/2024] [Accepted: 03/10/2024] [Indexed: 03/24/2024]
Abstract
This issue focuses on the past, the present and the future of clozapine. Of the 43 clozapine articles, nine are historical articles dealing with the past, 29 deal with the present and five with laboratory assays which may influence its future use. These 43 articles include 219 different authors from 56 countries/regions and five continents.
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Affiliation(s)
- Jose de Leon
- Department of Psychiatry, University of Kentucky, Lexington, KY, USA; 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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13
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Verdoux H, Quiles C, de Leon J. Optimizing co-prescription of clozapine and antiseizure medications: a systematic review and expert recommendations for clinical practice. Expert Opin Drug Metab Toxicol 2024; 20:347-358. [PMID: 38613254 DOI: 10.1080/17425255.2024.2343020] [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: 01/15/2024] [Accepted: 04/10/2024] [Indexed: 04/14/2024]
Abstract
INTRODUCTION Antiseizure medication (ASM) add-on to clozapine may be efficient to target clozapine-resistant mood or psychotic symptoms or clozapine-related adverse drug reactions (ADR) such as seizures. We aimed to synthesize the information relevant for clinical practice on the risks and benefits of clozapine-ASM co-prescription. AREAS COVERED Articles were identified with MEDLINE, Web of Sciences and PsycINFO search from inception through October 2023. The review was restricted to ASM with mood-stabilizing properties or with potential efficacy for resistant psychotic symptoms (valproate (VPA), lamotrigine, topiramate, carbamazepine, oxcarbazepine). EXPERT OPINION VPA add-on to clozapine is associated with a high risk of serious ADR (myocarditis, neutropenia, pneumonia) mostly explained by complex time-dependent drug-drug interactions. The initial inhibitory effects on clozapine metabolism require slow titration to avoid immuno-allergic reactions. After the titration period, VPA has mainly inductive effects on clozapine metabolism that are more marked in smokers requiring therapeutic drug monitoring. Lamotrigine and topiramate add-on may be recommended as the first-line treatment for clozapine-related seizures, but there is limited evidence regarding the efficacy of this strategy for clozapine-resistant psychotic symptoms. Carbamazepine should not be co-prescribed with clozapine because of its potential for agranulocytosis and for inducing clozapine metabolism.
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Affiliation(s)
- Hélène Verdoux
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, team pharmacoepidemiology, Bordeaux, France
| | - Clélia Quiles
- Centre Hospitalier Charles Perrens, Bordeaux, France
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
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Vaselli NM, Du Preez S, Jasenthu Kankanamage N. Clozapine-induced pneumonitis mimicking an atypical pneumonia. BMJ Case Rep 2024; 17:e259154. [PMID: 38531554 PMCID: PMC10966717 DOI: 10.1136/bcr-2023-259154] [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] [Indexed: 03/28/2024] Open
Abstract
Clozapine is an antipsychotic used for treatment-resistant schizophrenia with a significant side effect profile, including agranulocytosis, myocarditis and fever. Clozapine-induced fever often occurs in the first 2 weeks of treatment and settle after a few days. We report a case of a woman in her mid-30s who developed fever and infective symptoms suggestive of an atypical pneumonia while on clozapine titration. She was on clozapine for 16 days before developing high-grade fever, dry cough, diarrhoea, headache and photophobia with a very high CRP. We performed an extensive infection workup that returned negative results except for bilateral upper lobe ground glass changes of the lungs on CT. Despite antibiotic therapy, which would cover an atypical pneumonia, her CRP remained elevated and her fever persisted. Focus was directed to clozapine-induced pneumonitis as the cause for her symptoms. Her antibiotics were ceased, and clozapine was downtitrated. With the adjustment of her clozapine dose, her fevers and associated symptoms resolved, and CRP downtrended. Her fevers did not return when clozapine was uptitrated in the community subsequently. Clozapine-induced fever or other immune-allergic reactions should be systematically considered when patients develop fever during the initiation phase of clozapine therapy. Ruling out infective causes is desirable prior to attributing fevers to clozapine especially when they are accompanied by infective symptoms and high inflammatory markers. Careful downtitration of clozapine should be considered rather than abrupt cessation in managing clozapine-induced fevers and subsequent slow uptitration could be considered.
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Affiliation(s)
- Natasha Marcella Vaselli
- General Medicine, Gold Coast University Hospital, Southport, Queensland, Australia
- University of Liverpool Institute of Infection Veterinary and Ecological Sciences, Liverpool, UK
| | - Stanley Du Preez
- General Medicine, Gold Coast University Hospital, Southport, Queensland, Australia
- School of Medicine, Griffith University Faculty of Health, Gold Coast, Queensland, Australia
| | - Nuwan Jasenthu Kankanamage
- General Medicine, Gold Coast University Hospital, Southport, Queensland, Australia
- School of Medicine, Griffith University Faculty of Health, Gold Coast, Queensland, Australia
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Kikuchi Y, Tanifuji H, Ueno S, Onuma Y, Goto M, Ishihara M, Toraiwa T, Komatsu H, Tomita H. Patterns of C-reactive protein trends during clozapine titration and the onset of clozapine-induced inflammation: a case series of weekly and daily C-reactive protein monitoring. Front Psychiatry 2024; 15:1366621. [PMID: 38449505 PMCID: PMC10914995 DOI: 10.3389/fpsyt.2024.1366621] [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: 01/07/2024] [Accepted: 02/07/2024] [Indexed: 03/08/2024] Open
Abstract
Background International guidelines for clozapine titration recommend measuring C-reactive protein (CRP) weekly for 4 weeks after clozapine initiation to prevent fatal inflammatory adverse events, including myocarditis. However, limited evidence exists regarding whether weekly CRP monitoring can prevent clozapine-induced inflammation. Aims We examined the relationship between CRP trends and the development of clozapine-induced inflammation. We also explored the usefulness and limitations of CRP monitoring during clozapine titration. Method This study presents 17 and 4 cases of weekly and daily CRP monitoring during clozapine initiation, respectively. Results Among 17 patients with weekly CRP measurements, 7 had fever. Elevated CRP levels were detected before the onset of fever in two of the seven patients. Of the five remaining patients, the CRP levels on a previous test had been low; however, the fever developed suddenly. Of the 10 patients with no fever under weekly CRP monitoring, three had elevated CRP levels >3.0 mg/dL. Refraining from increasing the clozapine dose may have prevented fever in these patients. Among four patients with daily CRP measurements, two became febrile. In both cases, CRP levels increased almost simultaneously with the onset of fever. Conclusion Weekly and daily CRP monitoring during clozapine titration is valuable for preventing clozapine-induced inflammation, assessing its severity, and guiding clozapine dose adjustments. Weekly CRP monitoring may not adequately predict clozapine-induced inflammation in some cases. Consequently, clinicians should be aware of the sudden onset of clozapine-induced inflammation, even if CRP levels are low. Daily CRP monitoring is better for detecting clozapine-induced inflammation.
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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
| | - Hiroaki Tanifuji
- Department of Pharmacy, Kodama Hospital, Ishinomaki, Miyagi, Japan
| | - Sota Ueno
- Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan
| | - Yoshifumi Onuma
- Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan
| | - Masatomo Goto
- Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan
| | - Masato Ishihara
- Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan
| | - Takeshi Toraiwa
- Department of Psychiatry, Kodama Hospital, Ishinomaki, Miyagi, Japan
| | - Hiroshi Komatsu
- Department of Psychiatry, Tohoku University Hospital, Sendai, 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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Leung JG, Zhang L, Markota M, Ellingrod VL, Gerberi DJ, Bishop JR. A systematic review of clozapine-associated inflammation and related monitoring. Pharmacotherapy 2023; 43:1364-1396. [PMID: 37842767 DOI: 10.1002/phar.2887] [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: 07/13/2023] [Revised: 09/04/2023] [Accepted: 09/06/2023] [Indexed: 10/17/2023]
Abstract
Clozapine is an effective antipsychotic medication used for treatment-resistant schizophrenia. However, it is underutilized due to rigorous hematologic monitoring requirements and many adverse drug reactions. Publications have highlighted the occurrence of inflammatory reactions, some life-threatening, particularly during the early stages of clozapine treatment. Although guidelines have suggested monitoring for inflammatory processes during clozapine initiation, screening in clinical practice is not universal. This systematic review aimed to investigate the relationship between clozapine and inflammation and assess the importance of monitoring for inflammatory reactions. A comprehensive literature search yielded 6915 unique publication records after removal of duplicates. After a rigorous screening process, 75 publications were included in the review, which focused on three main aspects: (i) the impact of clozapine on inflammatory markers, (ii) monitoring cardiac and other organ function during clozapine-associated inflammatory processes, and (iii) monitoring non-specific signs and symptoms of inflammation. Elevated levels of C-reactive protein (CRP) and several proinflammatory cytokines have been observed in association with clozapine treatment. However, the practicality of measuring specific markers in clinical practice remains uncertain. Current evidence supports monitoring CRP levels during the first 4-8 weeks of treatment, especially to facilitate myocarditis screening. Further research is needed to establish clinically relevant CRP thresholds for intervention. The implementation of monitoring protocols during the early phase of clozapine treatment may mitigate adverse reactions and allow for continued use of clozapine. Future studies should also explore the association between clozapine-associated inflammation and pneumonia, as well as investigate the impact of inflammation on clozapine metabolism to predict the need for dose adjustment. These endeavors may facilitate the development and implementation of evidence-based guidelines for the monitoring of clozapine-associated inflammation.
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Affiliation(s)
| | - Lusi Zhang
- Department of Experimental and Clinical Pharmacology, University of Minnesota College of Pharmacy, Minneapolis, Minnesota, USA
| | - Matej Markota
- Department of Psychiatry and Psychology, Mayo Clinic, Rochester, Minnesota, USA
| | - Vicki L Ellingrod
- Department of Clinical Pharmacy, University of Michigan College of Pharmacy, Ann Arbor, Michigan, USA
- Department of Psychiatry, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | | | - Jeffrey R Bishop
- Department of Experimental and Clinical Pharmacology, University of Minnesota College of Pharmacy, Minneapolis, Minnesota, USA
- Department of Psychiatry and Behavioral Sciences, University of Minnesota Medical School, Minneapolis, Minnesota, USA
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Cordova VHS, Teixeira AD, Anzolin AP, Moschetta R, Belmonte-de-Abreu PS. Inflammatory markers in outpatients with schizophrenia diagnosis in regular use of clozapine: a cross-sectional study. Front Psychiatry 2023; 14. [DOI: https:/doi.org/10.3389/fpsyt.2023.1269322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2023] Open
Abstract
It is known that inflammation worsen the course of schizophrenia and induce high clozapine serum levels. However, no study evaluated this change in function of clozapine daily dose in schizophrenia. We assessed the correlation between inflammation and severity symptoms in patients with schizophrenia that take and do not take clozapine. We also assessed the correlation between clozapine daily dose and inflammatory markers to patients who take this drug. Patients were recruited from Schizophrenia Ambulatory and Psychosocial Care Center of Clinical Hospital of Porto Alegre and from an association of relatives of patients with schizophrenia. Exam results, and other important clinical exam were assessed in patients record or patients were asked to show their exam in the case of outpatients. We included 104 patients, 90 clozapine users and 14 non-clozapine users. We calculate the systemic inflammatory markers [neutrophil-lymphocyte ratio (NLR), systemic immune inflammation index (SII), and the psychopathology severity by the Brief Psychiatric Rating Scaled anchored (BPRS-a)]. These variables were compared between clozapine users and non-clozapine users. It was used mean/median test according to data distributing, with study factor (SII, MLR, and PLR), the clinical outcome: severity of symptomatology (BPRS score), and clozapine daily dose as adjustment factor. Clozapine users exhibited a significantly higher neutrophil count (mean ± SD: 5.03 ± 2.07) compared to non-clozapine users (mean ± SD: 3.48 ± 1.27; p = 0.031). After controlling for comorbidity, other parameters also showed significant differences. These findings are consistent with previous studies that have demonstrated an inflammatory response following the administration of clozapine.
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Cordova VHS, Teixeira AD, Anzolin AP, Moschetta R, Belmonte-de-Abreu PS. Inflammatory markers in outpatients with schizophrenia diagnosis in regular use of clozapine: a cross-sectional study. Front Psychiatry 2023; 14:1269322. [PMID: 37876624 PMCID: PMC10591218 DOI: 10.3389/fpsyt.2023.1269322] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Accepted: 09/15/2023] [Indexed: 10/26/2023] Open
Abstract
It is known that inflammation worsen the course of schizophrenia and induce high clozapine serum levels. However, no study evaluated this change in function of clozapine daily dose in schizophrenia. We assessed the correlation between inflammation and severity symptoms in patients with schizophrenia that take and do not take clozapine. We also assessed the correlation between clozapine daily dose and inflammatory markers to patients who take this drug. Patients were recruited from Schizophrenia Ambulatory and Psychosocial Care Center of Clinical Hospital of Porto Alegre and from an association of relatives of patients with schizophrenia. Exam results, and other important clinical exam were assessed in patients record or patients were asked to show their exam in the case of outpatients. We included 104 patients, 90 clozapine users and 14 non-clozapine users. We calculate the systemic inflammatory markers [neutrophil-lymphocyte ratio (NLR), systemic immune inflammation index (SII), and the psychopathology severity by the Brief Psychiatric Rating Scaled anchored (BPRS-a)]. These variables were compared between clozapine users and non-clozapine users. It was used mean/median test according to data distributing, with study factor (SII, MLR, and PLR), the clinical outcome: severity of symptomatology (BPRS score), and clozapine daily dose as adjustment factor. Clozapine users exhibited a significantly higher neutrophil count (mean ± SD: 5.03 ± 2.07) compared to non-clozapine users (mean ± SD: 3.48 ± 1.27; p = 0.031). After controlling for comorbidity, other parameters also showed significant differences. These findings are consistent with previous studies that have demonstrated an inflammatory response following the administration of clozapine.
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Affiliation(s)
- Victor Hugo Schaly Cordova
- Faculty of Medicine, Graduate Program in Psychiatry and Behavior Science, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
- Clinical Hospital of Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Amelia Dias Teixeira
- Faculty of Medicine, Graduate Program in Psychiatry and Behavior Science, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Ana Paula Anzolin
- Institute of Basic Health Science, Graduate Program in Biological Science: Biohemestry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
- Laboratory of Molecular Psychiatry, Clincal Hospital of Porto Alegre (HCPA), Porto Alegre, Brazil
| | - Roberta Moschetta
- Faculty of Medicine Undergraduate Course in Medine, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Paulo Silva Belmonte-de-Abreu
- Faculty of Medicine, Graduate Program in Psychiatry and Behavior Science, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
- Psychiatry Service, Clinical Hospital of Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
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Berger SJ, Hofer A. [Safety aspects during treatment with clozapine: : Adverse effects, titration, and therapeutic drug monitoring - a narrative review]. NEUROPSYCHIATRIE : KLINIK, DIAGNOSTIK, THERAPIE UND REHABILITATION : ORGAN DER GESELLSCHAFT OSTERREICHISCHER NERVENARZTE UND PSYCHIATER 2023; 37:122-129. [PMID: 37349671 PMCID: PMC10491532 DOI: 10.1007/s40211-023-00474-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 05/19/2023] [Indexed: 06/24/2023]
Abstract
BACKGROUND According to current guidelines, clozapine should be used as a third step in treatment resistant schizophrenia (TRS). In everyday clinical practice, however, it is frequently used at a much later stage, which leads to a significant deterioration of prognosis. The first part of this narrative overview focuses on the most frequent side effects of clozapine, on the relevance of slow titration, and on specific aspects of therapeutic drug monitoring (TDM). MATERIAL AND METHODS Medline, the Guideline for the use of clozapine 2013 of the Netherlands Clozapine Collaboration Group, and the S3 Guideline for Schizophrenia of the German Association for Psychiatry, Psychotherapy and Psychosomatics were searched for relevant literature, the last query dating from April 28th, 2023. RESULTS Despite its unique efficacy clozapine is underused in clinical practice and prescription varies between and within countries. Next to hematological, metabolic, and vegetative side effects, clozapine induced inflammation manifesting in the form of pneumonia or myocarditis, which is mainly associated with rapid titration, represents a major clinical challenge with CRP monitoring being of particular relevance. In this context, it also has to be noted that sex, smoking behavior, and ethnic origin impact clozapine metabolism, thus requiring personalized dosing. CONCLUSION Slow titration when possible, TDM, and CYP diagnostics when appropriate increase patient safety during treatment with clozapine and thus the likelihood of early prescription of this compound in TRS.
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Affiliation(s)
- Stefan J Berger
- Department für Psychiatrie, Psychotherapie, Psychosomatik und Medizinische Psychologie, Univ.-Klinik für Psychiatrie I, Medizinische Universität Innsbruck, Anichstr. 35, 6020, Innsbruck, Österreich
| | - Alex Hofer
- Department für Psychiatrie, Psychotherapie, Psychosomatik und Medizinische Psychologie, Univ.-Klinik für Psychiatrie I, Medizinische Universität Innsbruck, Anichstr. 35, 6020, Innsbruck, Österreich.
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De Las Cuevas C, Sanz EJ, Villasante-Tezanos AG, de Leon J. Respiratory aspiration during treatment with clozapine and other antipsychotics: a literature search and a pharmacovigilance study in VigiBase. Expert Opin Drug Metab Toxicol 2023; 19:57-74. [PMID: 36920343 DOI: 10.1080/17425255.2023.2192401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
INTRODUCTION Antipsychotics (APs), during treatment or overdose, may be associated with respiratory aspiration. AREAS COVERED A PubMed search on September 30, 2022, provided 3 cases of respiratory aspiration during clozapine therapy and 1 case during an AP overdose. VigiBase records of respiratory aspiration associated with APs from inception until September 5, 2021, were reviewed. VigiBase, the World Health Organization's global pharmacovigilance database, uses a statistical signal for associations called the information component (IC). EXPERT OPINION The ICs (and IC025) were 2.1 (and 2.0) for APs, 3.2 (and 3.0) for clozapine, 2.6 (and 2.4) for quetiapine, and 2.5 (and 2.2) for olanzapine. Cases of respiratory aspiration associated with APs included: 137 overdose/suicide cases (64 fatal) and 609 cases during treatment (385 fatal) including 333 taking clozapine (238 fatal). In logistic regression models of fatal outcomes, the odds ratios, OR, and (95% confidence intervals, CI) of significant independent variables were: a) 2.3 - 2.6 for clozapine in 3 samples of AP treatment of varying size, b) 1.9 (CI 1.0 to 3.5) for geriatric age in 284 patients on clozapine treatment, and c) 1.8 (CI 1.1 - 3.2) for antidepressant co-medication in 276 patients on non-clozapine APs. Multiple AP pharmacological mechanisms may explain respiratory aspiration.
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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
| | - Alejandro G Villasante-Tezanos
- Department of Preventive Medicine and Population Health, University of Texas Medical Branch, Galveston, Texas, United States
| | - Jose de Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, Kentucky, United States.,Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
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21
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de Leon J. Reflections on the Lack of Consideration of Ethnic Ancestry to Stratify Clozapine Dosing. Psychiatry Investig 2023; 20:183-195. [PMID: 36850057 PMCID: PMC10064212 DOI: 10.30773/pi.2022.0293] [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: 10/08/2022] [Revised: 12/17/2022] [Accepted: 12/26/2022] [Indexed: 03/01/2023] Open
Abstract
This review article argues against trusting standard clozapine references, including the US package insert, because they do not include advances in the sciences of pharmacokinetics and pharmacovigilance and ignore the effects of ethnic ancestry on therapeutic dosing. The minimum therapeutic dose leading to the minimum therapeutic concentration of 350 ng/mL in serum/plasma can be used to compare individuals/groups with treatment-resistant schizophrenia. The US clozapine package insert recommends targeting doses of 300-450 mg/day and, subsequently, increments of up to 100 mg with a maximum dose of 900 mg/day. Ethnic ancestry is defined by DNA ancestry group. Asians (people with ancestry ranging from Pakistan to Japan) and Indigenous Americans are similar in clozapine dosing; their average clozapine minimum therapeutic dose ranged from 166 mg/day (female non-smokers) to 270 mg/day (male smokers). For those with European ancestry, average clozapine minimum therapeutic doses ranged from 236 mg/day (female non-smokers) to 368 mg/day (male smokers). Based on limited studies, Black (African sub-Saharan ancestry) patients may be treated with typical US doses (300-600 mg/day), assuming no poor metabolism (PM) status. Ancestry's impact on clozapine lethality in four countries is discussed (two countries with highly homogenous populations, Denmark and Japan, and two countries with increasingly heterogenous populations due to immigration, Australia and the UK). An international guideline with 104 authors from 50 countries/regions was recently published, providing 6 personalized clozapine titration schedules for adult inpatients (3 ancestry groups and PM/non-PM schedules) and recommending c-reactive protein monitoring at baseline and weekly for 4 weeks.
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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 Apostol Hospital, University of the Basque Country, Vitoria, Spain
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22
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Aguglia A, Parisi VM, Arduino G, Amerio A, Costanza A, Serafini G, Amore M. Clozapine in a Young Female with Drug-Resistant Schizophrenia: A Case Report of Development of Serositis. CNS & NEUROLOGICAL DISORDERS DRUG TARGETS 2023; 22:313-316. [PMID: 35331125 DOI: 10.2174/1871527321666220324121207] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 12/29/2021] [Accepted: 01/17/2022] [Indexed: 12/16/2022]
Abstract
BACKGROUND Clozapine may be considered the first-line option for treatment-resistant schizophrenia (TRS), a condition that occurs in more than 30% of patients with schizophrenia. Despite its efficacy for treating TRS, clozapine use is limited by the occurrence of several adverse effects in more than 70% of cases. Clozapine does not typically affect lung function, although a few cases have been reported in the literature. CASE PRESENTATION To gain a better understanding of this rare event, here we report the case study of a young female with TRS, who was treated with clozapine and developed medium and bilateral pleural effusion relief with contiguous atelectasis and polyserositis. Two weeks after stopping clozapine, the follow-up chest scan showed complete remission of the pulmonary condition. We postulate that clozapine might have caused, in this case, a specific immunoinflammatory response leading to serosal complications. CONCLUSION Although the underlying mechanisms of this adverse effect are not completely understood, early manifestations, such as benign eosinophilia, fever, and flu-like symptoms need to be considered a potential warning to facilitate an early diagnosis and carefully manage pulmonary complications related to clozapine treatment.
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Affiliation(s)
- Andrea Aguglia
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), Section of Psychiatry, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Valentina Maria Parisi
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), Section of Psychiatry, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Gabriele Arduino
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), Section of Psychiatry, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Andrea Amerio
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), Section of Psychiatry, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Alessandra Costanza
- Department of Psychiatry, Faculty of Medicine, University of Geneva (UNIGE), Geneva, Switzerland
- Faculty of Biomedical Sciences, Università della Svizzera Italiana (USI), Lugano, Switzerland
| | - Gianluca Serafini
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), Section of Psychiatry, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Mario Amore
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), Section of Psychiatry, University of Genoa, Genoa, Italy
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
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23
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Nakamura M, Nagamine T. Clozapine-Induced Fever and Plasma Cytokine Changes in a Patient With Schizophrenia. Clin Neuropharmacol 2022; 45:179-183. [PMID: 36383917 DOI: 10.1097/wnf.0000000000000526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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24
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De Las Cuevas C, Arrojo-Romero M, Ruan CJ, Schoretsanitis G, Sanz EJ, de Leon J. Clozapine-induced myocarditis in children and adolescents: a pharmacovigilance study using VigiBase and a systematic literature review. Expert Opin Drug Metab Toxicol 2022; 18:715-727. [PMID: 36526610 DOI: 10.1080/17425255.2022.2160318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
INTRODUCTION Clozapine-induced myocarditis in children (age ≤18 yo) was studied from a PubMed search (18 July 2022) (9 cases) and from the World Health Organization's pharmacovigilance database, called Vigibase, of adverse drug reaction (ADR) reports (72 non-duplicated cases). VigiBase uses a logarithmic measure of disproportionality called the information component (IC). A logistic regression model of presence/absence (40/32) of seriousness in VigiBase was developed. AREAS COVERED VigiBase provided a significant myocarditis IC = 4.2 with an IC025 = 3.8; only 4 clozapine-induced myocarditis cases were expected, while 72 were observed. The PubMed search identified 9 cases, while VigiBase identified 72 cases (of which 67 did not overlap with published cases). These 76 combined cases included 35 doubtful (most with missing information on the day of diagnosis), 19 possible and 22 probable, according to the ADR scale. After adjusting for confounders, quetiapine increased the risk of seriousness with an odds ratio (OR) of 17.6 (95% confidence interval CI, 1.56 to 198.6), while Australian origin decreased it with an OR = 0.13 (CI, 0.04 to 0.47). EXPERT OPINION These 41 cases of at least possible clozapine-induced myocarditis indicated that this ADR can definitively occur in children, particularly in the first 30 days of up-titration. Children's and adult cases appeared similar.
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Affiliation(s)
- Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine and Instituto Universitario de Neurociencia (IUNE) University of La Laguna, Canary Islands, Spain.,Department of Psychiatry, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, Spain
| | - Manuel Arrojo-Romero
- Department of Psychiatry, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, 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, New York, USA
| | - 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, US.,Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apostol Hospital, University of the Basque Country, Vitoria, Spain
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25
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Kawakita Y, Takeshima M, Komatsu T, Imanishi A, Fujiwara D, Itoh Y, Mishima K. Relationship between clozapine exposure and the onset of appendicitis in schizophrenia patients: a retrospective cohort study. BMC Psychiatry 2022; 22:653. [PMID: 36271340 PMCID: PMC9587653 DOI: 10.1186/s12888-022-04312-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 10/12/2022] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE Clozapine may cause serious side effects despite benefits in patients with schizophrenia. Thus, an accurate understanding of the side-effect profile of clozapine is extremely important in the management of its administration to patients with schizophrenia. Our aim was to validate the relationship between clozapine exposure and appendicitis onset in patients with schizophrenia. METHODS In this study, we retrospectively compared the incidence and cumulative incidence of appendicitis in patients with schizophrenia with and without a history of clozapine exposure. Among the patients with schizophrenia who visited our hospital between June 2009 and August 2021, we extracted those with a history of clozapine treatment. Patients with a history of taking clozapine were defined as the clozapine exposure group, while the others were defined as the clozapine non-exposure group. Patients with a history of appendectomy before their initial visit to our hospital or with a history of clozapine use at other hospitals were excluded. RESULTS There were 65 patients in the clozapine exposure group and 400 patients in the clozapine non-exposure group who met the inclusion criteria. The exposure group exhibited a remarkably higher incidence of appendicitis during the observation period than the non-exposure group (863 cases vs. 124 cases per 100,000 person-years). In particular, if limited to the period of clozapine exposure, the incidence of appendicitis is extremely high, at 2,086 cases per 100,000 person-years. Moreover, multivariable analysis showed that clozapine exposure was an independent factor contributing to the onset of appendicitis. CONCLUSIONS Clozapine exposure is associated with appendicitis onset in patients with schizophrenia.
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Affiliation(s)
- Yuta Kawakita
- Department of Neuropsychiatry, Akita City Hospital, 4-30 Kawamoto Matsuokamachi, Akita City, 010-0933, Japan. .,Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan.
| | - Masahiro Takeshima
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Tomonari Komatsu
- Department of Neuropsychiatry, Noshiro Kousei Medical Center, Akita, Japan
| | - Aya Imanishi
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Dai Fujiwara
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Yu Itoh
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
| | - Kazuo Mishima
- grid.251924.90000 0001 0725 8504Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita, Japan
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26
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Ertuğrul A, Anıl Yağcıoğlu AE, Ağaoğlu E, Karakaşlı AA, Ak S, Yazıcı MK, de Leon J. Valproate, obesity and other causes of clozapine poor metabolism in the context of rapid titration may explain clozapine-induced myocarditis: A re-analysis of a Turkish case series. REVISTA DE PSIQUIATRIA Y SALUD MENTAL 2022; 15:281-286. [PMID: 36513403 DOI: 10.1016/j.rpsmen.2021.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 10/13/2021] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Clozapine-induced myocarditis or any clozapine-induced inflammation may be a hypersensitivity reaction due to titration that was too rapid for the patient's clozapine metabolism. Clozapine metabolism is influenced by ancestry, sex, smoking and the presence of confounders including obesity, infections, and inhibitors (e.g., valproate) causing the patient to behave as a clozapine poor metabolizer (PM). A published study in a Turkish hospital identified 1 case of clozapine-induced pancreatitis and hepatitis and 9 cases of clozapine-induced myocarditis. To explore the hypothesis that the 10 patients were clozapine PMs, their serum clozapine concentrations were investigated using concentration-to-dose (C/D) ratios and their titrations carefully reviewed. METHODS Dividing the trough serum concentration by the dose produces the clozapine C/D ratio. The dose required to reach 350ng/ml was considered the minimum therapeutic dosage and was used to classify patients according to clozapine PM status. Titration speed was assessed. RESULTS All 10 patients were possibly clozapine PMs (3 of them had as minimum therapeutic doses: 72, 82 or 83mg/day). Nine of the 10 patients may have behaved as clozapine PMs due to obesity and/or valproate co-prescription during titration. One also had an undiagnosed infection. Of the 10 patients, 9 had at least 1 of 3 factors: too-rapid titration in the first or second weeks, or a final dosage that was too high. CONCLUSIONS Future studies using clozapine levels and considering the role of clozapine PM status should explore whether or not all cases of clozapine-induced inflammation could be explained by lack of individualized titration.
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Affiliation(s)
- Aygün Ertuğrul
- Department of Psychiatry, Hacettepe University Faculty of Medicine, Ankara, Turkey.
| | | | - Esen Ağaoğlu
- Department of Psychiatry, Dörtyol State Hospital, Hatay, Turkey
| | - Ahmet Alp Karakaşlı
- Department of Psychiatry, Hitit University Faculty of Medicine, Çorum, Turkey
| | - Sertaç Ak
- Department of Psychiatry, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - M Kâzım Yazıcı
- Department of Psychiatry, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - 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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27
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De Las Cuevas C, Sanz EJ, Ruan CJ, de Leon J. Clozapine-associated myocarditis in the World Health Organization's pharmacovigilance database: Focus on reports from various countries. REVISTA DE PSIQUIATRIA Y SALUD MENTAL 2022; 15:238-250. [PMID: 36513400 DOI: 10.1016/j.rpsmen.2021.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 07/10/2021] [Indexed: 12/14/2022]
Abstract
INTRODUCTION The incidence of clozapine-associated myocarditis varies by country. These variations were explored in VigiBase, the World Health Organization's global database which has >25 million spontaneously reported adverse drug reaction (ADR) reports from 145 national drug agencies. METHODS On January 15, 2021, a search of VigiBase since inception focused on myocarditis in clozapine patients. The 3572 individual reports were studied using the standard VigiBase logarithmic measure of disproportionality called information component (IC). The IC measures the disproportionality between the expected and the reported rates. After duplicates were eliminated there were 3274 different patients with myocarditis studied in logistic regression models. RESULTS The first case was published in 1980 but since 1993 the VigiBase clozapine-myocarditis IC has been significant; moreover, currently it is very strong (IC=6.0, IC005-IC995=5.9-6.1) and statistically significantly different from other antipsychotics. Of the 3274 different patients with myocarditis, 43.4% were non-serious cases, 51.8% were serious but non-fatal, and 4.8% were fatal. More than half (1621/3274) of the reports came from Australia, of which 69.2% were non-serious, 27.7% serious but non-fatal, and 3.1% fatal. Asian countries contributed only 41 cases. CONCLUSIONS In pharmacovigilance studies, confounding factors may explain statistical associations, but the strength and robustness of these results are compatible with the hypothesis that myocarditis is definitively associated with early clozapine treatment (84% [1309/1560] and 5% [82/1560] in the first and second months). Myocarditis reports from Australia are over-represented to a major degree. Asian countries may be underreporting myocarditis to their drug agencies.
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Affiliation(s)
- Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, Instituto Universitario de Neurociencias (IUNE), University of La Laguna, Canary Islands, 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
| | - Can-Jun Ruan
- Laboratory of Clinical Psychopharmacology & The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Department of Psychiatry, The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders & Beijing Institute for Brain Disorders Center of Schizophrenia, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA; Psychiatry and Neurosciences Research Group (CTS-549), 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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28
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Kikuchi Y, Komatsu H, Sakuma A, Tanifuji H, Tomita H. Successful rechallenge with clozapine after discontinuation due to drug-induced pneumonia: A case report. PCN REPORTS : PSYCHIATRY AND CLINICAL NEUROSCIENCES 2022; 1:e38. [PMID: 38868700 PMCID: PMC11114276 DOI: 10.1002/pcn5.38] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 07/20/2022] [Accepted: 07/25/2022] [Indexed: 06/14/2024]
Abstract
Background There have been a limited number of case reports of clozapine-induced pneumonia. Few have reported rechallenging of clozapine after discontinuation due to the side-effect. Case Presentation A 43-year-old man was diagnosed with schizophrenia after developing auditory hallucinations and delusions of persecution and reference. After diagnosing him with treatment-resistant schizophrenia, clozapine was started. From a starting dose of 12.5 mg/day, we increased it by 25 mg every 2-3 days to reach 150 mg/day by Day 15. On Day 17, his body temperature suddenly rose to 39.6°C (103.3°F) without any other apparent physical symptoms. Blood biochemistry testing showed elevated C-reactive protein (CRP) and high counts of leukocytes and neutrophils, but not eosinophils. Chest computed tomography revealed ground-glass opacities in the lower lobes of both lungs. Suspecting bacterial pneumonia, we started him on levofloxacin 500 mg/day. However, pneumonia exacerbated, and eosinophilia became apparent 5 days after the onset of fever. We suspected acute eosinophilic pneumonia induced by clozapine and discontinued its administration the same day. The patient clinically recovered the next day after stopping clozapine. After stopping clozapine, his psychiatric symptoms, such as persecutory/referential delusions, irritability, and polydipsia, became worse. We decided to rechallenge with clozapine in incremental doses slower than the standard protocol, along with careful monitoring of CRP and eosinophil counts. Pneumonia has not recurred, and his psychiatric symptoms have been well managed. Conclusion Our experience suggests that some patients with inflammatory reactions to clozapine can still take the drug if it is reintroduced with caution.
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Affiliation(s)
- Yuki Kikuchi
- Department of PsychiatryKodama HospitalIshinomakiMiyagiJapan
| | - Hiroshi Komatsu
- Department of PsychiatryTohoku University HospitalSendaiMiyagiJapan
| | - Atsushi Sakuma
- Department of PsychiatryTohoku University HospitalSendaiMiyagiJapan
| | | | - Hiroaki Tomita
- Department of Psychiatry, Graduate School of MedicineTohoku UniversitySendaiMiyagiJapan
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29
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de Leon J. An international clozapine titration guideline for clozapine: An opportunity for moving forward on personalizing clozapine treatment in India and other countries. Indian J Psychiatry 2022; 64:331-334. [PMID: 36060712 PMCID: PMC9435622 DOI: 10.4103/indianjpsychiatry.indianjpsychiatry_423_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 06/29/2022] [Accepted: 06/29/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- 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
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30
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de Leon J, Ruan CJ, Schoretsanitis G, Rohde C, Yağcıoğlu EA, Baptista T, Kirilochev OO, De las Cuevas C, Correll CU. An international guideline with six personalised titration schedules for preventing myocarditis and pneumonia associated with clozapine. Gen Psychiatr 2022; 35:e100773. [PMID: 35866000 PMCID: PMC9244675 DOI: 10.1136/gpsych-2022-100773] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 06/14/2022] [Indexed: 12/12/2022] Open
Abstract
White blood cell (WBC) monitoring has reduced clozapine-treated patient deaths associated with agranulocytosis to a rarity. However, clozapine protocols and package inserts worldwide provide no instructions for preventing myocarditis or pneumonia during clozapine titrations. Prescribers worldwide are largely unaware of that. Meanwhile, as they worry about agranulocytosis, their clozapine-treated patients are at risk of dying from pneumonia or myocarditis. Consequently, an international guideline with 104 authors from 50 countries/regions was recently published to provide personalised clozapine titration schedules for adult inpatients. This forum article reviews pneumonia and myocarditis occurring during clozapine titration, as well as the three most innovative aspects of this new guideline: (1) personalised titration, (2) C reactive protein (CRP) measures, and (3) dose predictions based on blood levels. Clozapine metabolism is influenced by 3 levels of complexity: (1) ancestry groups, (2) sex-smoking subgroups, and (3) presence/absence of poor metabolizer status. These 3 groups of variables should determine the maintenance dose and speed of clozapine titration; they are summarised in a table in the full-text. The international clozapine titration guideline recommends measuring CRP levels simultaneously with WBC, at baseline and weekly at least for the first 4 weeks of titration, the highest risk period for clozapine-induced myocarditis.
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Affiliation(s)
- Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, Kentucky, USA
- Biomedical Research Centre in Mental Health Net (CIBERSAM), Hospital Santiago Apóstol, Vitoria-Gasteiz, Spain
| | - Can-Jun Ruan
- Laboratory of Clinical Psychopharmacology, Beijing An Ding Hospital, Beijing, China
- The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing An Ding Hospital, Beijing, China
| | - Georgios Schoretsanitis
- Psychiatry, University of Zürich, Zurich, Switzerland
- Psychiatry Research, Zucker Hillside Hospital, Glen Oaks, New York, USA
| | - Christopher Rohde
- Affective Disorders, Aarhus University Hospital, Aarhus, Denmark
- Clinical Medicine, Aarhus Universitet, Aarhus, Denmark
| | | | - Trino Baptista
- Physiology, Los Andes University Medical School, Merida, Bolivarian Republic of Venezuela
| | - Oleg O Kirilochev
- Clinical Pharmacology, Astrakhan State Medical University, Astrakhan, Astrahanskaâ, Russian Federation
| | - Carlos De las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry and Instituto Universitario de Neurociencia (IUNE), Universidad de La Laguna, La Laguna, Spain
| | - Christoph U Correll
- Psychiatry Research, Zucker Hillside Hospital, Glen Oaks, New York, USA
- Child and Adolescent Psychiatry, Charité Universitätsmedizin Berlin, Berlin, Germany
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31
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32
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de Filippis R, De Fazio P, Kane JM, Schoretsanitis G. Core clinical manifestations of clozapine-related DRESS syndrome: A network analysis. Schizophr Res 2022; 243:451-453. [PMID: 34364714 DOI: 10.1016/j.schres.2021.07.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 07/16/2021] [Accepted: 07/19/2021] [Indexed: 01/29/2023]
Affiliation(s)
- Renato de Filippis
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro 88100, Italy; The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, New York, USA.
| | - Pasquale De Fazio
- Psychiatry Unit, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro 88100, Italy
| | - John M Kane
- 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; Center for Psychiatric Neuroscience, Feinstein Institute for Medical Research, Manhasset, NY, USA
| | - Georgios Schoretsanitis
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, New York, USA; Department of Psychiatry, Psychotherapy and Psychosomatics, Hospital of Psychiatry, University of Zurich, Zurich, Switzerland
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Sheng HW, Wang HG, Wang CZ, Wu J, Huo LJ, Wang RX, Zhou YJ, Zhang XY. Prevalence and clinical characteristics of COVID-19 in inpatients with schizophrenia in Wuhan, China. World J Psychiatry 2022; 12:140-150. [PMID: 35111585 PMCID: PMC8783160 DOI: 10.5498/wjp.v12.i1.140] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 03/29/2021] [Accepted: 11/25/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND In contrast to many Western countries, China has maintained its large psychiatric hospitals. The prevalence and clinical characteristics of coronavirus disease 2019 (COVID-19) in inpatients with schizophrenia (SCZ) are unclear.
AIM To assess the prevalence of COVID-19 among inpatients with SCZ and compare the infected to uninfected SCZ patients in a Wuhan psychiatric hospital.
METHODS We retrospectively collected demographic characteristics and clinical profiles of all SCZ patients with COVID-19 at Wuhan’s Youfu Hospital.
RESULTS Among the 504 SCZ patients, 84 had COVID-19, and we randomly sampled 174 who were uninfected as a comparison group. The overall prevalence of COVID-19 in SCZ patients was 16.7%. Among the 84 SCZ patients with confirmed COVID-19, the median age was 54 years and 76.2% were male. The most common symptom was fever (82%), and less common symptoms were cough (31%), poor appetite (20%), and fatigue (16%). Compared with SCZ patients without COVID-19, those with COVID-19 were older (P = 0.006) and significantly lighter (P = 0.002), and had more comorbid physical diseases (P = 0.001). Surprisingly, those infected were less likely to be smokers (< 0.001) or to be treated with clozapine (P = 0.03). Further logistic regression showed that smoking [odds ratio (OR) = 5.61], clozapine treated (OR = 2.95), and male (OR = 3.48) patients with relatively fewer comorbid physical diseases (OR = 0.098) were at a lower risk for COVID-19. SCZ patients with COVID-19 presented primarily with fever, but only one-third had a cough, which might otherwise be the most common mode of transmission between individuals.
CONCLUSION Two unexpected protective factors for COVID-19 among SCZ inpatients are smoking and clozapine treatment.
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Affiliation(s)
- Hong-Wei Sheng
- Department of Psychiatry, Wuhan Youfu Hospital, Wuhan 430070, Hubei Province, China
| | - Hong-Gang Wang
- Qingdao Mental Health Center, Qingdao University, Qingdao 266000, Shandong Province, China
| | - Chun-Zhi Wang
- Qingdao Mental Health Center, Qingdao University, Qingdao 266000, Shandong Province, China
| | - Jiang Wu
- Department of Psychiatry, Wuhan Youfu Hospital, Wuhan 430070, Hubei Province, China
| | - Li-Jian Huo
- CAS Key Laboratory of Mental Health, Chinese Academy of Sciences, Beijing 10000, China
| | - Ruo-Xi Wang
- Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430070, Hubei Province, China
| | - Yong-Jie Zhou
- Department of Psychiatric Rehabilitation, Shenzhen Kangning Hospital, Shenzhen 510810, Guangdong Province, China
| | - Xiang-Yang Zhang
- CAS Key Laboratory of Mental Health, Chinese Academy of Sciences, Beijing 10000, China
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34
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Liu CI, Goh KK, Chen CH. Neutropenia after the coadministration of clozapine and nirmatrelvir-ritonavir in a patient with SARS-CoV-2 infection: A case report with a literature review. Front Psychiatry 2022; 13:1096006. [PMID: 36620672 PMCID: PMC9810620 DOI: 10.3389/fpsyt.2022.1096006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 12/05/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Schizophrenia is considered one of the major risk factors for mortality from SARS-CoV-2 infection. Early antiviral treatment is important to decrease the risk of mortality. Currently, Paxlovid (nirmatrelvir-ritonavir) has been widely used in SARS-CoV-2 patients with risk factors. However, drug-drug interactions with anti-psychotics are prominent and complicated. CASE PRESENTATION We report a clozapine-treated patient with SARS-CoV-2 infection who developed neutropenia after coadministration with Paxlovid. In this case, clozapine was used for over 15 years, without neutropenia development. However, severe neutropenia (absolute neutrophil count = 523/μl) developed 3 days after the coadministration of Paxlovid 2 doses per day, valproic acid 1,000 mg per day and clozapine 100 mg per day. The development of neutropenia may be attributed to the complicated interaction among Paxlovid, SARS-CoV-2 infection, valproic acid, fluvoxamine and clozapine. CONCLUSIONS Neutropenia is a rare but life-threatening event if a concomitant infection occurs. The risk may increase during SARS-CoV-2 infection and the coadministration of clozapine and Paxlovid. Although the exact causes of neutropenia in this patient are not fully clear, the white blood cell count and absolute neutrophil count should be closely monitored during the administration of Paxlovid in clozapine-treated patients with SARS-CoV-2 infection.
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Affiliation(s)
- Chun-I Liu
- Department of Psychiatry, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Kah Kheng Goh
- Department of Psychiatry, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Department of Psychiatry, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Psychiatric Research Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Chun-Hsin Chen
- Department of Psychiatry, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Department of Psychiatry, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Psychiatric Research Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
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35
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de Leon J, Schoretsanitis G, Smith RL, Molden E, Solismaa A, Seppälä N, Kopeček M, Švancer P, Olmos I, Ricciardi C, Iglesias-Garcia C, Iglesias-Alonso A, Spina E, Ruan CJ, Wang CY, Wang G, Tang YL, Lin SK, Lane HY, Kim YS, Kim SH, Rajkumar AP, González-Esquivel DF, Jung-Cook H, Baptista T, Rohde C, Nielsen J, Verdoux H, Quiles C, Sanz EJ, Las Cuevas CD, Cohen D, Schulte PFJ, Ertuğrul A, Yağcıoğlu AEA, Chopra N, McCollum B, Shelton C, Cotes RO, Kaithi AR, Kane JM, Farooq S, Ng CH, Bilbily J, Hiemke C, López-Jaramillo C, McGrane I, Lana F, Eap CB, Arrojo-Romero M, Rădulescu FŞ, Seifritz E, Every-Palmer S, Bousman CA, Bebawi E, Bhattacharya R, Kelly DL, Otsuka Y, Lazary J, Torres R, Yecora A, Motuca M, Chan SKW, Zolezzi M, Ouanes S, Berardis DD, Grover S, Procyshyn RM, Adebayo RA, Kirilochev OO, Soloviev A, Fountoulakis KN, Wilkowska A, Cubała WJ, Ayub M, Silva A, Bonelli RM, Villagrán-Moreno JM, Crespo-Facorro B, Temmingh H, Decloedt E, Pedro MR, Takeuchi H, Tsukahara M, Gründer G, Sagud M, Celofiga A, Ristic DI, Ortiz BB, Elkis H, Pacheco Palha AJ, LLerena A, Fernandez-Egea E, Siskind D, Weizman A, Masmoudi R, Saffian SM, Leung JG, Buckley PF, Marder SR, Citrome L, Freudenreich O, Correll CU, Müller DJ. An International Adult Guideline for Making Clozapine Titration Safer by Using Six Ancestry-Based Personalized Dosing Titrations, CRP, and Clozapine Levels. PHARMACOPSYCHIATRY 2021; 55:73-86. [PMID: 34911124 DOI: 10.1055/a-1625-6388] [Citation(s) in RCA: 111] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
This international guideline proposes improving clozapine package inserts worldwide by using ancestry-based dosing and titration. Adverse drug reaction (ADR) databases suggest that clozapine is the third most toxic drug in the United States (US), and it produces four times higher worldwide pneumonia mortality than that by agranulocytosis or myocarditis. For trough steady-state clozapine serum concentrations, the therapeutic reference range is narrow, from 350 to 600 ng/mL with the potential for toxicity and ADRs as concentrations increase. Clozapine is mainly metabolized by CYP1A2 (female non-smokers, the lowest dose; male smokers, the highest dose). Poor metabolizer status through phenotypic conversion is associated with co-prescription of inhibitors (including oral contraceptives and valproate), obesity, or inflammation with C-reactive protein (CRP) elevations. The Asian population (Pakistan to Japan) or the Americas' original inhabitants have lower CYP1A2 activity and require lower clozapine doses to reach concentrations of 350 ng/mL. In the US, daily doses of 300-600 mg/day are recommended. Slow personalized titration may prevent early ADRs (including syncope, myocarditis, and pneumonia). This guideline defines six personalized titration schedules for inpatients: 1) ancestry from Asia or the original people from the Americas with lower metabolism (obesity or valproate) needing minimum therapeutic dosages of 75-150 mg/day, 2) ancestry from Asia or the original people from the Americas with average metabolism needing 175-300 mg/day, 3) European/Western Asian ancestry with lower metabolism (obesity or valproate) needing 100-200 mg/day, 4) European/Western Asian ancestry with average metabolism needing 250-400 mg/day, 5) in the US with ancestries other than from Asia or the original people from the Americas with lower clozapine metabolism (obesity or valproate) needing 150-300 mg/day, and 6) in the US with ancestries other than from Asia or the original people from the Americas with average clozapine metabolism needing 300-600 mg/day. Baseline and weekly CRP monitoring for at least four weeks is required to identify any inflammation, including inflammation secondary to clozapine rapid titration.
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Affiliation(s)
- Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA.,Department of Psychiatry, University of Kentucky, Lexington, KY, USA.,Psychiatry and Neurosciences Research Group (CTS-549), 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
| | - 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
| | - Robert L Smith
- Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway
| | - Espen Molden
- Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway.,Section for Pharmacology and Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Oslo, Norway
| | - Anssi Solismaa
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.,Department of Psychiatry, Tampere University Hospital, Tampere, Finland
| | | | - Miloslav Kopeček
- National Institute of Mental Health, Klecany, Czech Republic.,Department of Psychiatry, Charles University, Third Faculty of Medicine, Prague, Czech Republic
| | - Patrik Švancer
- National Institute of Mental Health, Klecany, Czech Republic.,Department of Psychiatry, Charles University, Third Faculty of Medicine, Prague, Czech Republic
| | - 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
| | - Celso Iglesias-Garcia
- Universidad de Oviedo. CIBERSAM. INEUROPA. ISPA-FIMBA, Oviedo, Spain.,Hospital Valle del Nalón, Langreo, Spain
| | | | - Edoardo Spina
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Can-Jun Ruan
- Laboratory of Clinical Psychopharmacology, 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
| | - 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.,Department of Psychiatry, Beijing Anding Hospital, 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
| | - Yi-Lang Tang
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, Georgia, USA.,Substance Abuse Treatment Program, Atlanta VA Medical Center, Decatur, Georgia, USA
| | - Shih-Ku Lin
- Department of Psychiatry, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan.,Department of Psychiatry, School of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Hsien-Yuan Lane
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan.,Department of Psychiatry and Brain Disease Research Center, China Medical University Hospital, Taichung, Taiwan.,Department of Psychology, College of Medical and Health Sciences, Asia University, Taichung, Taiwan
| | - Yong Sik Kim
- Department of Neuropsychiatry, Nowon Eulji Medical Center, Eulji University, School of Medicine, Seoul, Korea
| | - Se Hyun Kim
- Department of Psychiatry, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Anto P Rajkumar
- Department of Psychiatry, Christian Medical College, Vellore, India.,Institute of Mental Health, Jubilee Campus, University of Nottingham, Triumph Road, Nottingham, United Kingdom
| | | | - Helgi Jung-Cook
- Instituto Nacional de Neurología y Neurocirugía, México City, México.,Facultad de Química, Universidad Nacional Autónoma de México (UNAM), México City, México
| | - Trino Baptista
- Department of Physiology, Los Andes University Medical School, Mérida, Venezuela
| | - Christopher Rohde
- Department of Affective Disorders, Aarhus University Hospital - Psychiatry, Aarhus, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Jimmi Nielsen
- Mental Health Centre Glostrup, Copenhagen University Hospital, Copenhagen, Denmark
| | - Hélène Verdoux
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, UMR 1219, F-33000 Bordeaux, France
| | - Clelia Quiles
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, UMR 1219, F-33000 Bordeaux, France
| | - 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, and Instituto Universitario de Neurociencia (IUNE), University of La Laguna, Canary Islands, Spain
| | - Dan Cohen
- Dutch Clozapine Collaboration Group, Castricum, The Netherlands.,FACT-team in Heerhugowaard, Department of Severe Mental Illness, Mental Health Services North-Holland North, The Netherlands
| | - Peter F J Schulte
- Dutch Clozapine Collaboration Group, Castricum, The Netherlands.,Mental Health Team Alkmaar, Mental Health Services Noord-Holland-Noord, Alkmaar, The Netherlands
| | - Aygün Ertuğrul
- Department of Psychiatry, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | | | - Nitin Chopra
- Addictions Division, Centre for Addiction and Mental Health, Toronto, Canada.,Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada
| | | | - Charles Shelton
- Department of Psychiatry, University of Kentucky, Lexington, KY, USA.,Eastern State Hospital, Lexington, Kentucky, USA
| | - Robert O Cotes
- Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, Georgia, USA
| | | | - John M Kane
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, New York, USA.,Department of Psychiatry and Molecular Medicine, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell Hempstead, New York, USA
| | - Saeed Farooq
- School of Medicine, Keele University, Staffordshire, and Midlands Partnership NHS Foundation Trust, Staffordshire, United Kingdom
| | - Chee H Ng
- Department of Psychiatry, The University of Melbourne, Melbourne, Victoria, Australia
| | - John Bilbily
- Department of Psychiatry, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Christoph Hiemke
- Department of Psychiatry and Psychotherapy, University Medical Center of Mainz, Germany
| | - Carlos López-Jaramillo
- Grupo de Investigación en Psiquiatría GIPSI, Departamento de Psiquiatría, Facultad de Medicina, Universidad de Antioquia, Medellin, Colombia.,Programa Trastornos del Ánimo, Hospital Universitario San Vicente Fundación, Medellín, Colombia
| | - Ian McGrane
- Department of Pharmacy Practice, University of Montana, Missoula, USA
| | - Fernando Lana
- Institute of Neuropsychiatry and Addictions (INAD), Parc de Salut Mar, Barcelona, Spain.,Department of Psychiatry, Autonomous University of Barcelona, Spain
| | - Chin B Eap
- Unit of Pharmacogenetics and Clinical Psychopharmacology, Center for Psychiatric Neurosciences, Lausanne University Hospital and University of Lausanne, Switzerland.,Center for Research and Innovation in Clinical Pharmaceutical Sciences, Lausanne University Hospital and University of Lausanne, Switzerland.,School of Pharmaceutical Sciences, University of Geneva, Switzerland.,Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, University of Lausanne, Switzerland
| | - Manuel Arrojo-Romero
- Department of Psychiatry, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, Spain
| | - Flavian Ş Rădulescu
- Center for Drug Sciences, Faculty of Pharmacy, University of Medicine and Pharmacy Carol Davila, Bucharest, Romania
| | - Erich Seifritz
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zürich, Zürich, Switzerland
| | - Susanna Every-Palmer
- Te Korowai Whāriki Central Regional Forensic Service, Capital and Coast District Health Board, Wellington, New Zealand.,Department of Psychological Medicine, University of Otago, Wellington, New Zealand
| | - Chad A Bousman
- Departments of Medical Genetics, Psychiatry, Physiology & Pharmacology, and Community Health Sciences University of Calgary, Alberta, Canada
| | - Emmanuel Bebawi
- Faculty of Medicine, University of Montreal, Montreal, Canada.,Department of Pharmacy, Hôpital du Sacré-Cœur de Montréal, Montreal, Canada
| | - Rahul Bhattacharya
- East London NHS Foundation Trust, London, United Kingdom.,Honorary Clinical Senior Lecturer, Barts and the London School of Medicine, Queen Mary University of London, United Kingdom
| | - Deanna L Kelly
- Department of Psychiatry, School of Medicine, Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Yuji Otsuka
- Department of Psychiatry, Asahi General Hospital, Chiba, Japan
| | - Judit Lazary
- National Institute of Mental Health, Neurology and Neurosurgery, Budapest, Hungary
| | - Rafael Torres
- Department of Psychiatry, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Agustin Yecora
- Secretaría de Salud Mental y Adicciones, Ministerio de Salud de la Provincia de Jujuy, San Salvador de Jujuy, Argentina
| | - Mariano Motuca
- Instituto Vilapriño, Center for Studies, Assistance and Research in Neurosciences, Mendoza, Argentina
| | - Sherry K W Chan
- Department of Psychiatry, LSK Faculty of Medicine, The University of Hong Kong, Hong Kong SAR.,State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong SAR
| | - Monica Zolezzi
- College of Pharmacy, QU Health, Qatar University, Doha, Qatar
| | - Sami Ouanes
- Department of Psychiatry, Hamad Medical Corporation, Doha, Qatar
| | | | - Sandeep Grover
- Department of Psychiatry, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Ric M Procyshyn
- British Columbia Mental Health and Substance Use Research Institute, Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada
| | | | - Oleg O Kirilochev
- Department of Clinical Pharmacology, Astrakhan State Medical University, Astrakhan, Russian Federation
| | - Andrey Soloviev
- Department of Psychiatry and Clinical Psychology, Northern State Medical University, Arkhangelsk, Russia
| | - Konstantinos N Fountoulakis
- 3rd Department of Psychiatry, Division of Neurosciences, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Greece
| | - Alina Wilkowska
- Department of Psychiatry, Medical University of Gdańsk, Gdańsk, Poland
| | - Wiesław J Cubała
- Department of Psychiatry, Medical University of Gdańsk, Gdańsk, Poland
| | - Muhammad Ayub
- Department of Psychiatry, Queens University, Kingston, Canada
| | - Alzira Silva
- Psychiatry Department, Centro Hospitalar Universitário de S. João, Porto, Portugal., Faculdade de Medicina da Universidade do Porto, Porto, Portugal
| | | | - José M Villagrán-Moreno
- Department of Neurosciences, Jerez University Hospital, Andalusian Health Service, University of Cadiz, Jerez, Spain
| | - Benedicto Crespo-Facorro
- Department of Psychiatry, School of Medicine, University Hospital Virgen del Rocio-IBIS, Sevilla, Spain., Spanish Network for Research in Mental Health (CIBERSAM), Sevilla, Spain
| | - Henk Temmingh
- Department of Psychiatry and Mental Health, University of Cape Town, Valkenberg Hospital, Western Cape, Cape Town, South Africa
| | - Eric Decloedt
- Division of Clinical Pharmacology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | | | - Hiroyoshi Takeuchi
- Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan
| | - Masaru Tsukahara
- Department of Psychiatry, Okayama Psychiatric Medical Center, Okayama, Japan
| | - Gerhard Gründer
- Central Institute of Mental Health, Department of Molecular Neuroimaging, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Marina Sagud
- Department of Psychiatry, School of Medicine, University of Zagreb, Zagreb, Croatia.,Department for Psychiatry and Psychological Medicine, University Hospital Center Zagreb, Croatia
| | - Andreja Celofiga
- Department of Psychiatry, University Medical Centre Maribor, Maribor, Slovenia
| | | | - Bruno B Ortiz
- Group of Resistant Schizophrenia (GER), Schizophrenia Program (Proesq), Federal University of Sao Paulo, SP, Brazil
| | - Helio Elkis
- Department and Institute of Psychiatry, University of São Paulo Medical School (FMUSP), Sao Paulo, Brazil
| | - António J Pacheco Palha
- Department and Institute of Psychiatry and Mental Health, Oporto Faculty of Medicine, Oporto, Portugal.,Casa de Salidedo Som Jesus (Psychiatric Hospital), Oporto, Portugal
| | - Adrián LLerena
- INUBE Biosanitary Research Institute of Extremadura. Extremadura University Hospital and Medical School, Badajoz, Spain.,Spanish Network for Research in Mental Health (CIBERSAM), Instituto de Salud Carlos III, Madrid, Spain
| | - Emilio Fernandez-Egea
- Cambridge Psychosis Centre, Cambrigeshire and Peterborough NHS Foundation Trust & Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom
| | - Dan Siskind
- Metro South Addiction and Mental Health Service, Brisbane, Australia.,Queensland Centre for Mental Health Research and School of Clinical Medicine, University of Queensland, Brisbane, Australia
| | - Abraham Weizman
- Research Unit, Geha Mental Health Center and Molecular Psychiatry Laboratory, Felsenstein Medical Research Center, Tel Aviv, Israel.,Department of Psychiatry Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Rim Masmoudi
- Psychiatry "A" Department, Hedi Chaker University Hospital, Sfax, Tunisia.,Faculty of Medicine, University of Sfax, Sfax, Tunisia
| | - Shamin Mohd Saffian
- Centre for Quality Management of Medicines, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | | | - Peter F Buckley
- School of Medicine, Virginia Commonwealth University, Richmond, VA, USA
| | - Stephen R Marder
- Semel Institute for Neuroscience at UCLA, Los Angeles, CA, USA.,VA Desert Pacific Mental Illness Research, Education, and Clinical Center, Los Angeles, CA, USA
| | - Leslie Citrome
- New York Medical College, Department of Psychiatry and Behavioral Sciences, Valhalla, NY, USA
| | - Oliver Freudenreich
- Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Christoph U Correll
- The Zucker Hillside Hospital, Psychiatry Research, Northwell Health, Glen Oaks, New York, USA.,Department of Psychiatry and Molecular Medicine, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell Hempstead, New York, USA.,Charité Universitätsmedizin Berlin, Department of Child and Adolescent Psychiatry, Berlin, Germany
| | - Daniel J Müller
- Addictions Division, Centre for Addiction and Mental Health, Toronto, Canada.,Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada
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36
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Javelot H, Straczek C, Meyer G, Gitahy Falcao Faria C, Weiner L, Drapier D, Fakra E, Fossati P, Weibel S, Dizet S, Langrée B, Masson M, Gaillard R, Leboyer M, Llorca PM, Hingray C, Haffen E, Yrondi A. Psychotropics and COVID-19: An analysis of safety and prophylaxis. L'ENCEPHALE 2021; 47:564-588. [PMID: 34548153 PMCID: PMC8410507 DOI: 10.1016/j.encep.2021.08.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 08/19/2021] [Indexed: 12/15/2022]
Abstract
The use of psychotropics during the COVID-19 pandemic has raised two questions, in order of importance: first, what changes should be made to pharmacological treatments prescribed to mental health patients? Secondly, are there any positive side effects of these substances against SARS-CoV-2? Our aim was to analyze usage safety of psychotropics during COVID-19; therefore, herein, we have studied: (i) the risk of symptomatic complications of COVID-19 associated with the use of these drugs, notably central nervous system activity depression, QTc interval enlargement and infectious and thromboembolic complications; (ii) the risk of mistaking the iatrogenic impact of psychotropics with COVID-19 symptoms, causing diagnostic error. Moreover, we provided a summary of the different information available today for these risks, categorized by mental health disorder, for the following: schizophrenia, bipolar disorder, anxiety disorder, ADHD, sleep disorders and suicidal risk. The matter of psychoactive substance use during the pandemic is also analyzed in this paper, and guideline websites and publications for psychotropic treatments in the context of COVID-19 are referenced during the text, so that changes on those guidelines and eventual interaction between psychotropics and COVID-19 treatment medication can be reported and studied. Finally, we also provide a literature review of the latest known antiviral properties of psychotropics against SARS-CoV-2 as complementary information.
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Affiliation(s)
- H Javelot
- Établissement public de santé Alsace Nord, 141, avenue Strasbourg, 67170 Brumath, France; Laboratoire de toxicologie et pharmacologie neuro cardiovasculaire, centre de recherche en biomédecine de Strasbourg, université de Strasbourg, 1, rue Eugène-Boeckel, 67000 Strasbourg, France.
| | - C Straczek
- Département de pharmacie, CHU d'Henri-Mondor, université Paris Est Créteil (UPEC), AP-HP, 1, rue Gustave-Eiffel, 94000 Créteil, France; Inserm U955, institut Mondor de recherche biomédical, neuropsychiatrie translationnelle, 8, rue du Général-Sarrail, 94000 Créteil, France
| | - G Meyer
- Service pharmacie, établissement public de santé Alsace Nord, 141, avenue Strasbourg, 67170 Brumath, France; Service pharmacie, CHU de Strasbourg, 1, porte de L'Hôpital, 67000 Strasbourg, France
| | - C Gitahy Falcao Faria
- Institute of Psychiatry, Federal University of Rio de Janeiro (UFRJ), avenue Pedro-Calmon, 550 - Cidade Universitária da Universidade Federal do Rio de Janeiro, 21941-901 Rio de Janeiro, Brazil
| | - L Weiner
- Clinique de psychiatrie, hôpitaux universitaire de Strasbourg, 1, porte de L'Hôpital, 67000 Strasbourg, France
| | - D Drapier
- Pôle hospitalo-universitaire de psychiatrie adulte, centre hospitalier Guillaume-Régnier, rue du Moulin-de-Joué, 35700 Rennes, France; EA 4712, comportements et noyaux gris centraux, université de Rennes 1, 2, avenue du Professeur Léon-Bernard, CS 34317, campus santé de Villejean, 35043 Rennes cedex, France
| | - E Fakra
- Pôle universitaire de psychiatrie, CHU de Saint-Étienne, 37, rue Michelet, 42000 Saint-Étienne, France
| | - P Fossati
- Inserm U1127, ICM, service de psychiatrie adultes, groupe hospitalier pitié Salpêtrière, Sorbonne université, AP-HP, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - S Weibel
- Clinique de psychiatrie, hôpitaux universitaire de Strasbourg, 1, porte de L'Hôpital, 67000 Strasbourg, France
| | - S Dizet
- Centre de ressources et d'expertise en psychopharmacologie (CREPP) Bourgogne Franche-Comté, Chalon-sur-Saône, France; Service Pharmacie, CHS de Sevrey, 55, rue Auguste-Champio, 71100 Sevrey, France
| | - B Langrée
- Service pharmacie, centre hospitalier Guillaume-Régnier, rue du Moulin-de-Joué, 35700 Rennes, France; Clinique du Château de Garches, Nightingale Hospitals-Paris, 11, bis rue de la Porte-Jaune, 92380 Garches, France
| | - M Masson
- SHU, GHU psychiatrie et neurosciences, 1, rue Cabanis, 75014 Paris, France; GHU psychiatrie et neurosciences, université de Paris, Paris, France
| | - R Gaillard
- Conseil national des universités (CNU), 1, rue Cabanis, 75014 Paris, France
| | - M Leboyer
- Inserm, DMU IMPACT, IMRB, translational neuropsychiatry, fondation FondaMental, hôpitaux universitaires « H. Mondor », université Paris Est Créteil (UPEC), AP-HP, 40, rue de Mesly, 94000 Créteil, France; CHU de Clermont-Ferrand, 58, rue Montalembert, 63000 Clermont-Ferrand, France
| | - P M Llorca
- Université Clermont-Auvergne, 1, rue Lucie- et Raymond-Aubrac, 63100 Clermont-Ferrand, France; Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, 1, rue Docteur Archambault, 54520 Laxou, France
| | - C Hingray
- Département de neurologie, CHU de Nancy, 25, rue Lionnois, 54000 Nancy, France; CIC-1431 Inserm, service de psychiatrie, CHU de Besançon, 3, boulevard Alexandre-Fleming, 25000 Besançon, France
| | - E Haffen
- Laboratoire de neurosciences, université de Franche-Comté, 19, rue Ambroise-Paré, 25030 Besançon cedex, France
| | - A Yrondi
- Unité ToNIC, UMR 1214 CHU Purpan-Pavillon Baudot, place du Dr Joseph Baylac, 31024 Toulouse cedex 3, France
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Valproate, obesity and other causes of clozapine poor metabolism in the context of rapid titration may explain clozapine-induced myocarditis: A re-analysis of a Turkish case series. REVISTA DE PSIQUIATRIA Y SALUD MENTAL 2021. [DOI: 10.1016/j.rpsm.2021.10.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Pallares Vela E, Dave P, Cancarevic I. Clozapine-Related Thromboembolic Events. Cureus 2021; 13:e16883. [PMID: 34513458 PMCID: PMC8412001 DOI: 10.7759/cureus.16883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 08/04/2021] [Indexed: 11/05/2022] Open
Abstract
Clozapine is an atypical antipsychotic used for treatment-resistant schizophrenia. Venous thromboembolism (VTE) is a rare side effect of clozapine which can be fatal. This article summarizes current evidence regarding the risk of VTE associated with the use of clozapine. We performed a PubMed (MeSH) and Google Scholar search for the last two decades. Studies or case reports performed in humans were included in the review, of which 42 case reports of patients taking clozapine at VTE onset were included in the analysis of this review. According to the articles reviewed, the mean age was 42.9 years, with more males (71.43%) than females (28.57%). The average clozapine dose was 285.62 mg/day. VTE onset occurred within the first six months in 71.8% of the cases. Overall, 70.37% of the patients had comorbidities, and 87.5% had risk factors for VTE. In total, 68.57% were prescribed other medications at VTE onset, and 60% were being treated with another antipsychotic concomitantly. Finally, 32.5% of the patients died, while 67.5% survived. In 60% of the cases, clozapine was discontinued after VTE. In our literature review, we observed that among clozapine users, VTE occurred at a wide dose range, and most of the events occurred within the first six months. As many patients who are prescribed clozapine have risk factors for VTE, the risk should be considered at the time of prescribing. Further research should be conducted to elucidate the risk of VTE in clozapine users and the benefits of thromboprophylaxis.
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Affiliation(s)
- Elisa Pallares Vela
- General Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Prashil Dave
- General Practice, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Ivan Cancarevic
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
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De Las Cuevas C, Sanz EJ, Ruan CJ, de Leon J. Clozapine-associated myocarditis in the World Health Organization's pharmacovigilance database: Focus on reports from various countries. REVISTA DE PSIQUIATRIA Y SALUD MENTAL 2021; 15:S1888-9891(21)00070-7. [PMID: 34298164 DOI: 10.1016/j.rpsm.2021.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 07/08/2021] [Accepted: 07/10/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION The incidence of clozapine-associated myocarditis varies by country. These variations were explored in VigiBase, the World Health Organization's global database which has >25 million spontaneously reported adverse drug reaction (ADR) reports from 145 national drug agencies. METHODS On January 15, 2021, a search of VigiBase since inception focused on myocarditis in clozapine patients. The 3572 individual reports were studied using the standard VigiBase logarithmic measure of disproportionality called information component (IC). The IC measures the disproportionality between the expected and the reported rates. After duplicates were eliminated there were 3274 different patients with myocarditis studied in logistic regression models. RESULTS The first case was published in 1980 but since 1993 the VigiBase clozapine-myocarditis IC has been significant; moreover, currently it is very strong (IC=6.0, IC005-IC995=5.9-6.1) and statistically significantly different from other antipsychotics. Of the 3274 different patients with myocarditis, 43.4% were non-serious cases, 51.8% were serious but non-fatal, and 4.8% were fatal. More than half (1621/3274) of the reports came from Australia, of which 69.2% were non-serious, 27.7% serious but non-fatal, and 3.1% fatal. Asian countries contributed only 41 cases. CONCLUSIONS In pharmacovigilance studies, confounding factors may explain statistical associations, but the strength and robustness of these results are compatible with the hypothesis that myocarditis is definitively associated with early clozapine treatment (84% [1309/1560] and 5% [82/1560] in the first and second months). Myocarditis reports from Australia are over-represented to a major degree. Asian countries may be underreporting myocarditis to their drug agencies.
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Affiliation(s)
- Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, Instituto Universitario de Neurociencias (IUNE), University of La Laguna, Canary Islands, 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
| | - Can-Jun Ruan
- Laboratory of Clinical Psychopharmacology & The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China; Department of Psychiatry, The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders & Beijing Institute for Brain Disorders Center of Schizophrenia, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, KY, USA; Psychiatry and Neurosciences Research Group (CTS-549), 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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Sernoskie SC, Jee A, Uetrecht JP. The Emerging Role of the Innate Immune Response in Idiosyncratic Drug Reactions. Pharmacol Rev 2021; 73:861-896. [PMID: 34016669 DOI: 10.1124/pharmrev.120.000090] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Idiosyncratic drug reactions (IDRs) range from relatively common, mild reactions to rarer, potentially life-threatening adverse effects that pose significant risks to both human health and successful drug discovery. Most frequently, IDRs target the liver, skin, and blood or bone marrow. Clinical data indicate that most IDRs are mediated by an adaptive immune response against drug-modified proteins, formed when chemically reactive species of a drug bind to self-proteins, making them appear foreign to the immune system. Although much emphasis has been placed on characterizing the clinical presentation of IDRs and noting implicated drugs, limited research has focused on the mechanisms preceding the manifestations of these severe responses. Therefore, we propose that to address the knowledge gap between drug administration and onset of a severe IDR, more research is required to understand IDR-initiating mechanisms; namely, the role of the innate immune response. In this review, we outline the immune processes involved from neoantigen formation to the result of the formation of the immunologic synapse and suggest that this framework be applied to IDR research. Using four drugs associated with severe IDRs as examples (amoxicillin, amodiaquine, clozapine, and nevirapine), we also summarize clinical and animal model data that are supportive of an early innate immune response. Finally, we discuss how understanding the early steps in innate immune activation in the development of an adaptive IDR will be fundamental in risk assessment during drug development. SIGNIFICANCE STATEMENT: Although there is some understanding that certain adaptive immune mechanisms are involved in the development of idiosyncratic drug reactions, the early phase of these immune responses remains largely uncharacterized. The presented framework refocuses the investigation of IDR pathogenesis from severe clinical manifestations to the initiating innate immune mechanisms that, in contrast, may be quite mild or clinically silent. A comprehensive understanding of these early influences on IDR onset is crucial for accurate risk prediction, IDR prevention, and therapeutic intervention.
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Affiliation(s)
- Samantha Christine Sernoskie
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy (S.C.S., J.P.U.), and Department of Pharmacology and Toxicology, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada (A.J., J.P.U.)
| | - Alison Jee
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy (S.C.S., J.P.U.), and Department of Pharmacology and Toxicology, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada (A.J., J.P.U.)
| | - Jack Paul Uetrecht
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy (S.C.S., J.P.U.), and Department of Pharmacology and Toxicology, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada (A.J., J.P.U.)
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Verdoux H, Debruyne AL, Queuille E, De Leon J. A reappraisal of the role of fever in the occurrence of neurological sequelae following lithium intoxication: a systematic review. Expert Opin Drug Saf 2021; 20:827-838. [PMID: 33789560 DOI: 10.1080/14740338.2021.1912011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION We aimed to review cases of Syndrome of Irreversible Lithium-Effectuated Neurotoxicity (SILENT) characterized by neurological sequelae following acute lithium toxicity and to explore whether cerebellar sequelae are more frequent in cases presenting with fever and/or infection. AREAS COVERED Case reports were identified from: (i) 6 reviews published up to 2005; (ii) MEDLINE, Web of Sciences, Cochrane Library and PsycINFO search. EXPERT OPINION We identified 123 SILENT cases published from 1965 to 2019, in which cerebellar sequelae were observed in an overwhelming proportion (79%). SILENT may occur at any time during lithium treatment. This complication is most frequently observed during routine lithium treatment, with fewer than 10% of cases occurring after accidental or intentional overdoses. SILENT may occur even when lithium plasma levels are within the therapeutic range: 63% of cases had lithium plasma level <2.5 mEq/l (low/mild toxicity). Fever and/or infection were reported in nearly half of the patients (48%). The likelihood of presenting with cerebellar vs. other neurological sequelae was independently increased by elevated plasma lithium level (≥ 2.5 mEq/l) and by a history of fever and/or infection. Lithium users should be warned of the need to consult in case of fever to adjust their lithium dosage.
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Affiliation(s)
- Hélène Verdoux
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, Team Pharmacoepidemiology, Bordeaux, France.,Centre Hospitalier Charles Perrens, Bordeaux, France
| | | | | | - Jose De Leon
- Mental Health Research Center at Eastern State Hospital, Lexington, KY and Psychiatry and Neurosciences Research Group (CTS-549), USA.,Psychiatry and Neurosciences Research Group (CTS-549), 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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European Whites May Need Lower Minimum Therapeutic Clozapine Doses Than Those Customarily Proposed. J Clin Psychopharmacol 2021; 41:140-147. [PMID: 33587398 DOI: 10.1097/jcp.0000000000001341] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
PURPOSE/BACKGROUND A nomogram from a British naturalistic study proposed that the clozapine dosing needed to reach a serum concentration of 350 ng/mL ranged from 265 mg/d (female nonsmokers) to 525 mg/d (male smokers). Some European reviews have used these dosing recommendations, which seem greater than what we found in an Italian White sample ranging from 245 mg/d (female nonsmokers) to 299 mg/d (male smokers). Five other published samples of European Whites were added to the Italian sample to estimate clozapine doses recommended for reaching 350 ng/mL. METHODS/PROCEDURES Average clozapine metabolizers were obtained by eliminating outliers with confounding variables: (1) psychiatric inducers and inhibitors; (2) doses less than 100 mg/d; and (3) when possible, patients with inflammation, obesity, or using oral contraceptives. The study included 1363 average metabolizer European Whites: the Italian sample and 5 new samples. Mean averages that reached serum concentration levels of 350 ng/mL were calculated after stratification by sex and smoking status in each sample. Then, weighted mean averages were obtained by combining the 6 samples. FINDINGS/RESULTS The estimated weighted mean clozapine dosages ranged from 236 to 368 mg/d (236 mg/d in 218 female nonsmokers, 256 mg/d in 340 male nonsmokers, 357 mg/d in 269 female smokers, and 368 mg/d in 546 male smokers). IMPLICATIONS/CONCLUSIONS Our recommended dosages are less than those recommended in Europe. Future studies in European Whites need to replicate these recommended doses for average metabolizer patients after sex and smoking stratification and further explore clozapine dosing for those with relevant clinical confounders.
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Schoretsanitis G, Ruan CJ, Rohde C, Verdoux H, De Las Cuevas C, Spina E, de Leon J. An update on the complex relationship between clozapine and pneumonia. Expert Rev Clin Pharmacol 2021; 14:145-149. [PMID: 33461363 DOI: 10.1080/17512433.2021.1877135] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Can-Jun Ruan
- Laboratory of Clinical Psychopharmacology, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Christopher Rohde
- Department of Affective Disorders, Aarhus University Hospital - Psychiatry, Aarhus, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Mental Health Centre Glostrup, Copenhagen University Hospital, Copenhagen, Denmark
| | - Hélène Verdoux
- Team Pharmacoepidemiology, University Bordeaux, Inserm, Bordeaux Population Health Research Center, Bordeaux, France
| | - Carlos De Las Cuevas
- Department of Internal Medicine, Dermatology and Psychiatry, School of Medicine, University of la Laguna, Canary Islands, Spain
| | - Edoardo Spina
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Jose de Leon
- University of Kentucky Mental Health Research Center at Eastern State Hospital, Lexington, KY, USA.,Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain.,Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
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Adding Oral Contraceptives to Clozapine May Require Halving the Clozapine Dose: A New Case and a Literature Review. J Clin Psychopharmacol 2021; 40:308-310. [PMID: 32332470 DOI: 10.1097/jcp.0000000000001202] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Zhao T, Zhang K, Zhang Y, Yang Y, Ning X, Hu Y, Li X, Zhang Y, Xia L, Ren Z, Liu H. Do proinflammatory cytokines play a role in clozapine-associated glycometabolism disorders? Psychopharmacology (Berl) 2021; 238:1979-1990. [PMID: 33774704 PMCID: PMC8233252 DOI: 10.1007/s00213-021-05824-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 03/15/2021] [Indexed: 12/12/2022]
Abstract
RATIONALE AND OBJECTIVE Clozapine (CLZ) is the most effective drug for treatment-resistant schizophrenia but is associated with many side effects, including glycometabolism disorders. Immunological mechanisms may be involved in the development of clozapine side effects. Research relating the immunomodulatory effects of clozapine and its early markers to clinically relevant adverse events is needed to reduce the harmful side effects of clozapine. This study aimed to investigate the role of proinflammatory cytokines in clozapine-associated glycometabolism disorders. METHODS We measured the effect of a range of doses of clozapine on glycometabolism-related parameters and proinflammatory cytokines levels in mice peripheral blood. We also examined the differences between these indicators in the peripheral blood of clozapine-treated schizophrenia patients and healthy controls. Furthermore, we detected proinflammatory cytokines expression in mice pancreatic tissue. RESULTS Following clozapine administration, glucagon significantly decreased in mouse serum, and proinflammatory cytokine IL-β levels markedly increased. Clozapine reliably increased proinflammatory cytokines (IL-1β, IL-6, and TNF-α) expression in murine pancreatic tissue. Compared with healthy controls, clozapine-treated patients' BMI, blood glucose, and proinflammatory cytokines (IL-1β, IL-6, and TNF-α) increased significantly. In clozapine-treated patients, a higher clozapine daily dosage was associated with higher levels of the proinflammatory cytokines IL-1β and IL-6, and a significant positive correlation was observed between blood glucose levels and the proinflammatory cytokines IL-6 and TNF-α. CONCLUSION Findings from animal experiments and clinical trials have shown clear evidence that clozapine has a regulatory effect on immune-related proinflammatory cytokines and influences glycometabolism indicators.
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Affiliation(s)
- Tongtong Zhao
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Kai Zhang
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Yelei Zhang
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Yating Yang
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Xiaoshuai Ning
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Yu Hu
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Xiaoyue Li
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Yulong Zhang
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Lei Xia
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province China ,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province China
| | - Zhenhua Ren
- Department of Anatomy, Anhui Medical University, Road Hefei, Meishan, 81, Anhui Province, China.
| | - Huanzhong Liu
- Department of Psychiatry, Chaohu Hospital of Anhui Medical University, 64 North Chaohu Road, Hefei, Anhui Province, China. .,Anhui Psychiatric Center, Anhui Medical University, Hefei, Anhui Province, China.
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Flanagan RJ, Lally J, Gee S, Lyon R, Every-Palmer S. Clozapine in the treatment of refractory schizophrenia: a practical guide for healthcare professionals. Br Med Bull 2020; 135:73-89. [PMID: 32885238 PMCID: PMC7585831 DOI: 10.1093/bmb/ldaa024] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/18/2020] [Accepted: 06/29/2020] [Indexed: 12/11/2022]
Abstract
BACKGROUND Clozapine remains the only medication licensed for treating refractory schizophrenia. However, it remains underutilized in part due to concerns regarding adverse events. SOURCES OF DATA Published literature. AREAS OF AGREEMENT Common adverse events during clozapine treatment include sedation, hypersalivation, postural hypotension, dysphagia, gastrointestinal hypomotility, weight gain, diabetes mellitus and dyslipidaemia. Rare but serious events include agranulocytosis, cardiomyopathy, myocarditis, pneumonia, paralytic ileus and seizure. AREAS OF CONTROVERSY It remains unclear how best to minimize clozapine-induced morbidity/mortality (i) during dose titration, (ii) from hypersalivation and (iii) from gastrointestinal hypomotility. It is also unclear how clozapine pharmacokinetics are affected by (i) gastrointestinal hypomotility, (ii) systemic infection and (iii) passive exposure to cigarette smoke. Whether monthly haematological monitoring needs to continue after 12 months of uninterrupted therapy is also a subject of debate. GROWING POINTS There is a need for better management of serious clozapine-related adverse events in addition to agranulocytosis. There is also a need for better education of patients and carers, general practitioners, A&E and ITU staff and others of the problems posed in using clozapine safely. AREAS TIMELY FOR DEVELOPING RESEARCH There is a need for more research on assessing clozapine dosage (i) as patients get older, (ii) with respect to exposure to cigarette smoke and (iii) optimizing response if adverse events or other factors limit dosage.
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Affiliation(s)
- R J Flanagan
- Precision Medicine, Networked Services, Bessemer Wing, King's College Hospital NHS Foundation Trust, Denmark Hill, London SE5 9RS, UK.,Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, De Crespigny Park, London SE5 8AF, UK
| | - J Lally
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, De Crespigny Park, London SE5 8AF, UK.,Department of Psychiatry, Mater Misericordiae University Hospital, 63 Eccles Street, Dublin 7, Ireland.,Department of Psychiatry, Royal College of Surgeons in Ireland, 123 St Stephen's Green, Dublin 2, Ireland
| | - S Gee
- Pharmacy Department, South London and Maudsley NHS Foundation Trust, Denmark Hill, London SE5 8AZ, UK
| | - R Lyon
- Department of Pharmacy, Sussex Partnership NHS Foundation Trust, Chichester Centre, Graylingwell Drive, Chichester, West Sussex PO19 6GS UK
| | - S Every-Palmer
- Department of Psychological Medicine, University of Otago, Wellington, PO Box 7343, Newtown, Wellington 6242, NZ
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Kikuchi K, Yasui-Furukori N, Yokoyama S, Hasegawa C, Kokubun A, Katsukura S, Shimizu T, Shimoda K. Clozapine-associated severe eosinophilia following lithium rebound neutropenia: A case report. Neuropsychopharmacol Rep 2020; 40:388-391. [PMID: 32951324 PMCID: PMC7722653 DOI: 10.1002/npr2.12143] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 08/20/2020] [Accepted: 08/24/2020] [Indexed: 12/19/2022] Open
Abstract
Background Clozapine use is complicated by an increased risk of hematological adverse effects such as neutropenia and, rarely, eosinophilia. Case presentation We present the case of a 48‐year‐old man with treatment‐resistant schizophrenia. On day 12 after clozapine initiation, he had a cough with a temperature of 39.8°C. On day 16, his leukocyte count had increased to 9320 cells/mm3 (neutrophils 7550 cells/mm3 and eosinophils 680 cells/mm3). We discontinued lithium because of neutrophilia and damage to renal function on day 20. His eosinophil count increased until day 29, reaching 6750 cells/mm3. We suspected a drug‐induced reaction and discontinued clozapine on day 30. His eosinophil count gradually decreased, reaching the normal range by day 40. However, his leukocyte and neutrophil counts also gradually decreased to below than the normal range by day 40. His leukocytes and neutrophil counts had recovered by day 55. Conclusion We concluded that this patient had clozapine‐associated severe eosinophilia following lithium rebound neutropenia. The eosinophil count increased reaching 6750 cells/mm3 with bronchitis and hepatitis during clozapine treatment. The leukocyte and neutrophil counts gradually decreased to below than the normal range by day 40 after discontinuation of lithium.
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Affiliation(s)
- Kota Kikuchi
- Department of Psychiatry, School of Medicine, Dokkyo Medical University, Tochigi, Japan
| | - Norio Yasui-Furukori
- Department of Psychiatry, School of Medicine, Dokkyo Medical University, Tochigi, Japan
| | - Saaya Yokoyama
- Department of Psychiatry, School of Medicine, Dokkyo Medical University, Tochigi, Japan.,Department of Psychiatry, Okamotodai Hospital, Tochigi, Japan
| | - Chie Hasegawa
- Department of Psychiatry, School of Medicine, Dokkyo Medical University, Tochigi, Japan
| | - Atsuhiko Kokubun
- Department of Diagnostic and Generalist Medicine, School of Medicine, Dokkyo Medical University Hospital, Tochigi, Japan
| | - Shinichi Katsukura
- Department of Diagnostic and Generalist Medicine, School of Medicine, Dokkyo Medical University Hospital, Tochigi, Japan
| | - Taro Shimizu
- Department of Diagnostic and Generalist Medicine, School of Medicine, Dokkyo Medical University Hospital, Tochigi, Japan
| | - Kazutaka Shimoda
- Department of Psychiatry, School of Medicine, Dokkyo Medical University, Tochigi, Japan
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Verdoux H, Quiles C. Educational needs and psychoeducation interventions in clozapine users: a narrative review. Acta Psychiatr Scand 2020; 142:96-108. [PMID: 32266962 DOI: 10.1111/acps.13172] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/29/2020] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Increasing users' knowledge about the expected benefits and risks of clozapine may contribute to the initiation and maintenance of clozapine in persons with treatment-resistant schizophrenia (TRS). The objective was to identify the educational needs of clozapine users and the interventions aimed at addressing these needs. METHOD We systematically searched multiple electronic databases for articles: (i) exploring educational needs of clozapine users and of their relatives; and (ii) reporting educational interventions aimed at addressing these needs. Data were synthesized narratively. RESULTS A total of 30 articles published from 1990 to 2019 in 8 countries fulfilled our inclusion criteria. As most studies on educational needs (n = 18) were carried out in persons already taking clozapine, educational needs of TRS patients who were candidates for clozapine treatment are not well documented. Users' level of knowledge about clozapine was often poor, especially about adverse effects or interactions with other substances, with a poor retention of information delivered at treatment initiation. Among 12 studies reporting educational interventions in clozapine users, five provided quantitative outcomes. Their findings suggest that structured educational programmes may contribute to promote clozapine initiation and to improve users' knowledge about this drug. CONCLUSION The literature is sparse on structured educational interventions about clozapine, and only one randomized controlled trial was identified. A promising strategy emerging from this review may be staging educational interventions according to the evolving needs of persons with TRS before clozapine use, at initiation and during maintenance treatment.
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Affiliation(s)
- H Verdoux
- Bordeaux Population Health Research Center, Team Pharmacoepidemiology, UMR 1219, Inserm, University of Bordeaux, Bordeaux, France.,Centre Hospitalier Charles Perrens, Bordeaux, France
| | - C Quiles
- Centre Hospitalier Charles Perrens, Bordeaux, France
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de Leon J, Schoretsanitis G, Kane JM, Ruan CJ. Using therapeutic drug monitoring to personalize clozapine dosing in Asians. Asia Pac Psychiatry 2020; 12:e12384. [PMID: 32119764 DOI: 10.1111/appy.12384] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 01/19/2020] [Accepted: 02/10/2020] [Indexed: 12/27/2022]
Abstract
This narrative review on clozapine blood levels or therapeutic drug monitoring (TDM) includes sections focused on drug clearance and TDM, personalized dosing with TDM, clinical applications of TDM in Asians, and areas needing further study. Asian patients need half the clozapine dose (D) used in the United States to get the same blood concentrations (C). The concentration-to-dose (C/D) ratio measures drug clearance. In the United States, the average clozapine patient usually needs from 300 to 600 mg/day to reach 350 ng/mL. US male smokers reach this therapeutic C with a D of 600 mg/day (C/D ratio of 0.60 = 600/350), whereas US female nonsmokers usually need a D of 300 mg/day (C/D ratio of 1.17 = 300/350). While in the United States, average CLO C/D ratios typically are 0.6-1.2 ng/mL per mg/day, in Asian populations they range from 1.20 in male smokers to 2.40 in female smokers, requiring Ds of 300 to 150 mg/day to obtain 350 ng/mL. Asian patients can become clozapine poor metabolizers (PMs), needing very low Ds (50-150 mg/day) to get therapeutic Cs, by taking inhibitors (fluvoxamine, oral contraceptives and valproic acid), due to obesity, or during inflammations with systemic effects. In 573 Asian patients from five samples, around 1% were PMs due to taking inhibitors, 1% due to inflammation, 1% due to obesity, and 7% were potential genetic PMs. The potential genetic PMs ranged between 3% and 13%, but this prevalence will have to be better established in future studies including genetic testing for possible CYP1A2 mutations, which may explain PM status.
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Affiliation(s)
- Jose de Leon
- Mental Health Research Center, Eastern State Hospital, Lexington, Kentucky.,Psychiatry and Neurosciences Research Group (CTS-549), Institute of Neurosciences, University of Granada, Granada, Spain.,Biomedical Research Centre in Mental Health Net (CIBERSAM), Santiago Apóstol Hospital, University of the Basque Country, Vitoria, Spain
| | - Georgios Schoretsanitis
- Department of Psychiatry Research, Zucker Hillside Hospital, Northwell Health, Glen Oaks, New York
| | - John M Kane
- Department of Psychiatry Research, Zucker Hillside Hospital, Northwell Health, Glen Oaks, New York.,Department of Psychiatry and Molecular Medicine, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, New York
| | - Can-Jun Ruan
- Laboratory of Clinical Psychopharmacology & The National Clinical Research Centre for Mental Disorders & Beijing Key Lab of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
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Javelot H, Llorca PM, Drapier D, Fakra E, Hingray C, Meyer G, Dizet S, Egron A, Straczek C, Roser M, Masson M, Gaillard R, Fossati P, Haffen E. [Informations on psychotropics and their adaptations for patients suffering from mental disorders in France during the SARS-CoV-2 epidemic]. Encephale 2020; 46:S14-S34. [PMID: 32376004 PMCID: PMC7196532 DOI: 10.1016/j.encep.2020.04.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 04/17/2020] [Indexed: 12/11/2022]
Abstract
The 2019-20 coronavirus pandemic (SARS-CoV-2; severe acute respiratory syndrome coronavirus 2) has dramatic consequences on populations in terms of morbidity and mortality and in social terms, the general confinement of almost half of the world's population being a situation unprecedented in history, which is difficult today to measure the impact at the individual and collective levels. More specifically, it affects people with various risk factors, which are more frequent in patients suffering from psychiatric disorders. Psychiatrists need to know: (i) how to identify, the risks associated with the prescription of psychotropic drugs and which can prove to be counterproductive in their association with COVID-19 (coronavirus disease 2019), (ii) how to assess in terms of benefit/risk ratio, the implication of any hasty and brutal modification on psychotropic drugs that can induce confusion for a differential diagnosis with the evolution of COVID-19. We carried out a review of the literature aimed at assessing the specific benefit/risk ratio of psychotropic treatments in patients suffering from COVID-19. Clinically, symptoms suggestive of COVID-19 (fever, cough, dyspnea, digestive signs) can be caused by various psychotropic drugs and require vigilance to avoid false negatives and false positives. In infected patients, psychotropic drugs should be used with caution, especially in the elderly, considering the pulmonary risk. Lithium and Clozapine, which are the reference drugs in bipolar disorder and resistant schizophrenia, warrant specific attention. For these two treatments the possibility of a reduction in the dosage - in case of minimal infectious signs and in a situation, which does not allow rapid control - should ideally be considered taking into account the clinical response (even biological; plasma concentrations) observed in the face of previous dose reductions. Tobacco is well identified for its effects as an inducer of CYP1A2 enzyme. In a COVID+ patient, the consequences of an abrupt cessation of smoking, particularly related with the appearance of respiratory symptoms (cough, dyspnea), must therefore be anticipated for patients receiving psychotropics metabolized by CYP1A2. Plasma concentrations of these drugs are expected to decrease and can be related to an increase risk of relapse. The symptomatic treatments used in COVID-19 have frequent interactions with the most used psychotropics. If there is no curative treatment for infection to SARS-CoV-2, the interactions of the various molecules currently tested with several classes of psychotropic drugs (antidepressants, antipsychotics) are important to consider because of the risk of changes in cardiac conduction. Specific knowledge on COVID-19 remains poor today, but we must recommend rigor in this context in the use of psychotropic drugs, to avoid adding, in patients suffering from psychiatric disorders, potentially vulnerable in the epidemic context, an iatrogenic risk or loss of efficiency.
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Affiliation(s)
- H Javelot
- Établissement Public de Santé Alsace Nord, Brumath, France; Laboratoire de toxicologie et pharmacologie neuro-cardiovasculaire, université de Strasbourg, Strasbourg, France.
| | - P-M Llorca
- CHU de Clermont-Ferrand, Clermont-Ferrand, France; Université Clermont Auvergne, Clermont-Ferrand, France
| | - D Drapier
- Pôle hospitalo-universitaire de psychiatrie adulte, centre hospitalier Guillaume-Régnier, Rennes, France; EA 4712, comportements et noyaux gris centraux, université de Rennes 1, Rennes, France
| | - E Fakra
- Pôle universitaire de psychiatrie, CHU de Saint-Étienne, Saint-Étienne, France
| | - C Hingray
- Pôle hospitalo-universitaire de psychiatrie d'adultes du Grand Nancy, centre psychothérapique de Nancy, Laxou, France; Département de neurologie, CHU de Nancy, Nancy, France
| | - G Meyer
- Service de pharmacie, Établissement Public de Santé Alsace Nord, Brumath, France; Service de pharmacie, CHU de Strasbourg, Strasbourg, France
| | - S Dizet
- Service de pharmacie, CHS de Sevrey, Chalon-sur-Saône, France
| | - A Egron
- Service de pharmacie, centre hospitalier de Cadillac, Cadillac, France
| | - C Straczek
- Département de pharmacie, CHU Henri-Mondor, Créteil, France; Institut Mondor de recherche biomédical, Inserm U955, équipe 15 neuropsychiatrie translationnelle, Créteil, France
| | - M Roser
- Institut Mondor de recherche biomédical, Inserm U955, équipe 15 neuropsychiatrie translationnelle, Créteil, France; Service de psychiatrie sectorisée, hôpital Albert-Chenevier, Créteil, France
| | - M Masson
- Nightingale Hospitals-Paris, clinique du Château de Garches, Garches, France; SHU, GHU psychiatrie et neurosciences, Paris, France
| | - R Gaillard
- GHU psychiatrie et neurosciences, université de Paris, Paris, France; Sous-section 49-03, Conseil national des universités (CNU), Paris, France
| | - P Fossati
- Inserm U1127, service de psychiatrie adultes, ICM, groupe hospitalier Pitié-Salpêtrière, Sorbonne université, AP-HP, Paris, France
| | - E Haffen
- CIC-1431 Inserm, service de psychiatrie, CHU de Besançon, Besançon, France; Laboratoire de neurosciences, université de Franche-Comté, Besançon, France
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