1
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Chalabianloo F, Høiseth G, Vold JH, Johansson KA, Kringen MK, Dalgard O, Ohldieck C, Druckrey-Fiskaaen KT, Aas C, Løberg EM, Bramness JG, Fadnes LT. Impact of liver fibrosis and clinical characteristics on dose-adjusted serum methadone concentrations. J Addict Dis 2023; 41:53-63. [PMID: 35356868 DOI: 10.1080/10550887.2022.2057140] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
BACKGROUND There is limited knowledge on the causes of large variations in serum methadone concentrations and dose requirements. OBJECTIVES We investigated the impact of the degree of liver fibrosis on dose-adjusted steady-state serum methadone concentrations. METHODS We assessed the clinical and laboratory data of 155 Norwegian patients with opioid use disorder undergoing methadone maintenance treatment in outpatient clinics in the period 2016-2020. A possible association between the degree of liver fibrosis and dose-adjusted serum methadone concentration was explored using a linear mixed-model analysis. RESULTS When adjusted for age, gender, body mass index, and genotypes of CYP2B6 and CYP3A5, the concentration-to-dose ratio of methadone did not increase among the participants with liver fibrosis (Coefficient: 0.70; 95% CI: -2.16, 3.57; P: 0.631), even among those with advanced cirrhosis (-0.50; -4.59, 3.59; 0.810). CONCLUSIONS Although no correlation was found between the degree of liver stiffness and dose-adjusted serum methadone concentration, close clinical monitoring should be considered, especially among patients with advanced cirrhosis. Still, serum methadone measurements can be considered a supplement to clinical assessments, taking into account intra-individual variations.
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Affiliation(s)
- Fatemeh Chalabianloo
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway.,Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - Gudrun Høiseth
- Department of Forensic Medicine, Oslo University Hospital, Oslo, Norway.,Center for psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway.,Norwegian Center for Addiction Research, University of Oslo, Oslo, Norway
| | - Jørn Henrik Vold
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway.,Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.,Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Kjell Arne Johansson
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway.,Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | | | - Olav Dalgard
- Infectious Disease Department, Akershus University Hospital, Akerhus, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Christian Ohldieck
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway
| | - Karl Trygve Druckrey-Fiskaaen
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway.,Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - Christer Aas
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway.,Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - Else-Marie Løberg
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway.,Division of Psychiatry, Haukeland University Hospital, Bergen, Norway.,NORMENT Centre of Excellence, Haukeland University Hospital, Bergen, Norway.,Faculty of Psychology, Department of Clinical Psychology, University of Bergen, Bergen, Norway
| | - Jørgen G Bramness
- Institute of Clinical Medicine, UiT - Norway's Arctic University, Tromsø, Norway.,Department of Alcohol, Tobacco and Drugs, Norwegian Institute of Public Health, Oslo, Norway
| | - Lars Thore Fadnes
- Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway.,Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
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2
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Pereira JG, Fernandes J, Duarte AR, Fernandes SM. β-Lactam Dosing in Critical Patients: A Narrative Review of Optimal Efficacy and the Prevention of Resistance and Toxicity. Antibiotics (Basel) 2022; 11:antibiotics11121839. [PMID: 36551496 PMCID: PMC9774837 DOI: 10.3390/antibiotics11121839] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 12/13/2022] [Accepted: 12/16/2022] [Indexed: 12/24/2022] Open
Abstract
Antimicrobial prescription in critically ill patients represents a complex challenge due to the difficult balance between infection treatment and toxicity prevention. Underexposure to antibiotics and therapeutic failure or, conversely, drug overexposure and toxicity may both contribute to a worse prognosis. Moreover, changes in organ perfusion and dysfunction often lead to unpredictable pharmacokinetics. In critically ill patients, interindividual and intraindividual real-time β-lactam antibiotic dose adjustments according to the patient's condition are critical. The continuous infusion of β-lactams and the therapeutic monitoring of their concentration have both been proposed to improve their efficacy, but strong data to support their use are still lacking. The knowledge of the pharmacokinetic/pharmacodynamic targets is poor and is mostly based on observational data. In patients with renal or hepatic failure, selecting the right dose is even more tricky due to changes in drug clearance, distribution, and the use of extracorporeal circuits. Intermittent usage may further increase the dosing conundrum. Recent data have emerged linking overexposure to β-lactams to central nervous system toxicity, mitochondrial recovery delay, and microbiome changes. In addition, it is well recognized that β-lactam exposure facilitates resistance selection and that correct dosing can help to overcome it. In this review, we discuss recent data regarding real-time β-lactam antibiotic dose adjustment, options in special populations, and the impacts on mitochondria and the microbiome.
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Affiliation(s)
- João Gonçalves Pereira
- Hospital Vila Franca de Xira, 2600-009 Vila Franca de Xira, Portugal
- Grupo de Investigação e Desenvolvimento em Infeção e Sépsis, 4450-681 Matosinhos, Portugal
- Correspondence: ; Tel.: +351-96-244-1546
| | - Joana Fernandes
- Centro Hospitalar de Trás-os-Montes e Alto Douro, 5000-508 Vila Real, Portugal
| | - Ana Rita Duarte
- Nova Medical School, Universidade NOVA de Lisboa, 1099-085 Lisbon, Portugal
| | - Susana Mendes Fernandes
- Grupo de Investigação e Desenvolvimento em Infeção e Sépsis, 4450-681 Matosinhos, Portugal
- Clínica Universitária de Medicina Intensiva, Faculdade de Medicina, Universidade de Lisboa, 1649-004 Lisboa, Portugal
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3
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Schilling U, Hsin CH, Delahaye S, Krause A, Wuelfrath H, Halabi A, Dingemanse J. Influence of hepatic impairment on the pharmacokinetics and pharmacodynamics of the P2Y12 receptor antagonist selatogrel. Clin Transl Sci 2022; 15:1906-1915. [PMID: 35583936 PMCID: PMC9372424 DOI: 10.1111/cts.13298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 03/18/2022] [Accepted: 04/24/2022] [Indexed: 11/29/2022] Open
Abstract
Selatogrel is a potent and selective reversible P2Y12 receptor antagonist in development for early treatment of acute myocardial infarction via subcutaneous (s.c.) self‐injection. Selatogrel is almost exclusively eliminated via the hepatobiliary route. Hepatic impairment is associated with reduced drug clearance and primary hemostasis. This single‐center, open‐label study investigated the effect of mild and moderate hepatic impairment on pharmacokinetics (PK) and pharmacodynamics (PD) of a single s.c. dose of selatogrel (16 mg). The study included groups of eight subjects with mild and moderate hepatic impairment, and matched healthy control subjects. Compared to healthy subjects, exposure to selatogrel in subjects with mild and moderate hepatic impairment was 30% and 108% (maximum plasma concentration [Cmax]) and 47% and 212% (area under the concentration‐time curve from zero to infinity [AUC0–∞]) higher, respectively. Hepatic impairment was associated with lower clearance and volume of distribution, whereas plasma protein binding was not affected. Marked inhibition of platelet aggregation (IPA > 80%) was attained within 30 min in all subjects and hepatic impairment prolonged IPA duration. Area under the effect curve was 60% and 160% higher in subjects with mild and moderate hepatic impairment, respectively. PK/PD modeling identified a change in the relationship between exposure and IPA, with a steeper concentration‐effect relationship in healthy subjects compared to subjects with hepatic impairment. The combination of higher exposure and lower half‐maximum inhibitory concentration resulted in longer lasting effect. In conclusion, hepatic impairment alters the PK/PD relationship leading to prolonged effects. Therefore, dose adjustments may be warranted in subjects with moderate hepatic impairment.
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Affiliation(s)
- Uta Schilling
- Idorsia Pharmaceuticals Ltd., Allschwil, Switzerland
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4
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Ostroumova OD, Pereverzev AP. Hepatic impairment as a risk factor of adverse drug reactions. CONSILIUM MEDICUM 2021. [DOI: 10.26442/20751753.2021.12.201234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
There are a lot of clinical variants of hepatic impairment ranging from asymptomatic increase in transaminases to acute liver failure and fulminant hepatitis. Hepatic impairment is a polietiologic syndrome. According to the epidemiological study conducted in the United States (19982008), the main causes of hepatic impairment were paracetamol overdose (46%), idiopathic liver dysfunction (14%), other drugs (excluding paracetamol, 11%), viral hepatitis B (7%), other infectious and non-infectious diseases with liver damage (except for viral hepatitis) 7%, autoimmune hepatitis (5%), ischemic hepatitis (syn. hypoxic hepatitis, liver infarction) 4%, viral hepatitis A (3%) and Wilson's disease (2%). Hepatic impairment have a direct impact on the pharmacokinetics and pharmacodynamics of drugs decreasing clearance, elimination and excretion of drugs. Also Transjugular intrahepatic porto-systemic shunts, which are often used to treat portal hypertension in patients with liver cirrhosis, can significantly reduce the presystemic elimination of drugs, thereby increasing their absorption. Moreover, in patients with liver cirrhosis, concomitant renal dysfunction also requires an adjustment of the dose of drugs. Correction of pharmacotherapy in accordance to pharmacokinetic and pharmacodynamic changes of drugs ingested by patients with impaired liver function will improve the quality of medical care and reduce the risks of adverse drug reactions.
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5
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El-Khateeb E, Achour B, Al-Majdoub ZM, Barber J, Rostami-Hodjegan A. Non-uniformity of Changes in Drug-Metabolizing Enzymes and Transporters in Liver Cirrhosis: Implications for Drug Dosage Adjustment. Mol Pharm 2021; 18:3563-3577. [PMID: 34428046 PMCID: PMC8424631 DOI: 10.1021/acs.molpharmaceut.1c00462] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
Liver cirrhosis is
a chronic disease that affects the liver structure,
protein expression, and overall metabolic function. Abundance data
for drug-metabolizing enzymes and transporters (DMET) across all stages
of disease severity are scarce. Levels of these proteins are crucial
for the accurate prediction of drug clearance in hepatically impaired
patients using physiologically based pharmacokinetic (PBPK) models,
which can be used to guide the selection of more precise dosing. This
study aimed to experimentally quantify these proteins in human liver
samples and assess how they can impact the predictive performance
of the PBPK models. We determined the absolute abundance of 51 DMET
proteins in human liver microsomes across the three degrees of cirrhosis
severity (n = 32; 6 mild, 13 moderate, and 13 severe),
compared to histologically normal controls (n = 14),
using QconCAT-based targeted proteomics. The results revealed a significant
but non-uniform reduction in the abundance of enzymes and transporters,
from control, by 30–50% in mild, 40–70% in moderate,
and 50–90% in severe cirrhosis groups. Cancer and/or non-alcoholic
fatty liver disease-related cirrhosis showed larger deterioration
in levels of CYP3A4, 2C8, 2E1, 1A6, UGT2B4/7, CES1, FMO3/5, EPHX1,
MGST1/3, BSEP, and OATP2B1 than the cholestasis set. Drug-specific
pathways together with non-uniform changes of abundance across the
enzymes and transporters under various degrees of cirrhosis necessitate
the use of PBPK models. As case examples, such models for repaglinide,
dabigatran, and zidovudine were successful in recovering disease-related
alterations in drug exposure. In conclusion, the current study provides
the biological rationale behind the absence of a single dose adjustment
formula for all drugs in cirrhosis and demonstrates the utility of
proteomics-informed PBPK modeling for drug-specific dose adjustment
in liver cirrhosis.
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Affiliation(s)
- Eman El-Khateeb
- Centre for Applied Pharmacokinetic Research, University of Manchester, Manchester M13 9PT, U.K.,Clinical Pharmacy Department, Faculty of Pharmacy, Tanta University, Tanta 31527, Egypt
| | - Brahim Achour
- Centre for Applied Pharmacokinetic Research, University of Manchester, Manchester M13 9PT, U.K
| | - Zubida M Al-Majdoub
- Centre for Applied Pharmacokinetic Research, University of Manchester, Manchester M13 9PT, U.K
| | - Jill Barber
- Centre for Applied Pharmacokinetic Research, University of Manchester, Manchester M13 9PT, U.K
| | - Amin Rostami-Hodjegan
- Centre for Applied Pharmacokinetic Research, University of Manchester, Manchester M13 9PT, U.K.,Certara UK Ltd. (Simcyp Division), Sheffield S1 2BJ, U.K
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6
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Frost CE, Ly V, Garonzik SM. Apixaban Pharmacokinetics and Pharmacodynamics in Subjects with Mild or Moderate Hepatic Impairment. Drugs R D 2021; 21:375-384. [PMID: 34363188 PMCID: PMC8602549 DOI: 10.1007/s40268-021-00359-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/15/2021] [Indexed: 12/02/2022] Open
Abstract
Background Hepatic impairment can impact apixaban pharmacokinetics and pharmacodynamics by decreasing cytochrome P450-mediated metabolism and factor X production. Objective This study evaluated the effect of mild or moderate (Child–Pugh A and B) hepatic impairment on apixaban pharmacokinetics, pharmacodynamics, and safety. Methods This open-label, parallel-group, single-dose study included eight mildly and eight moderately hepatically impaired subjects, and 16 healthy subjects. Subjects received a single oral apixaban 5-mg dose (day 1). Pharmacokinetic, pharmacodynamic, and safety assessments were completed at prespecified time points. Apixaban maximum plasma concentration and area under the concentration–time curve to infinity were compared between subjects with hepatic impairment and healthy subjects. Results Apixaban area under the concentration–time curve to infinity point estimates and 90% confidence intervals were 1.03 (0.80–1.32) and 1.09 (0.85–1.41) for subjects with mild and moderate hepatic impairment vs healthy subjects. Maximum plasma concentration results were similar. Mean (standard deviation) apixaban unbound fraction was 6.8% (1.4), 7.9% (1.8), and 7.1% (1.3) in subjects with mild or moderate hepatic impairment and in healthy subjects. Mean change from baseline in international normalized ratio (3 h post-dose) was 14.7%, 12.7%, and 10.7% for subjects with mild or moderate hepatic impairment and healthy subjects, respectively. A direct relationship was observed between apixaban anti-factor Xa activity and plasma concentration across groups. No serious adverse events or discontinuations due to adverse events occurred. Conclusions Mild or moderate hepatic impairment had no clinically relevant impact on apixaban pharmacokinetic or pharmacodynamic measures, suggesting that dose adjustment may not be required.
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Affiliation(s)
- Charles E Frost
- Research and Development, Bristol Myers Squibb, Route 206 and Province Line Road, Princeton, NJ, 08543, USA
| | - Van Ly
- Research and Development, Bristol Myers Squibb, Route 206 and Province Line Road, Princeton, NJ, 08543, USA
| | - Samira M Garonzik
- Research and Development, Bristol Myers Squibb, Route 206 and Province Line Road, Princeton, NJ, 08543, USA.
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7
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Lin YS, Thummel KE, Thompson BD, Totah RA, Cho CW. Sources of Interindividual Variability. Methods Mol Biol 2021; 2342:481-550. [PMID: 34272705 DOI: 10.1007/978-1-0716-1554-6_17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The efficacy, safety, and tolerability of drugs are dependent on numerous factors that influence their disposition. A dose that is efficacious and safe for one individual may result in sub-therapeutic or toxic blood concentrations in others. A significant source of this variability in drug response is drug metabolism, where differences in presystemic and systemic biotransformation efficiency result in variable degrees of systemic exposure (e.g., AUC, Cmax, and/or Cmin) following administration of a fixed dose.Interindividual differences in drug biotransformation have been studied extensively. It is recognized that both intrinsic factors (e.g., genetics, age, sex, and disease states) and extrinsic factors (e.g., diet , chemical exposures from the environment, and the microbiome) play a significant role. For drug-metabolizing enzymes, genetic variation can result in the complete absence or enhanced expression of a functional enzyme. In addition, upregulation and downregulation of gene expression, in response to an altered cellular environment, can achieve the same range of metabolic function (phenotype), but often in a less predictable and time-dependent manner. Understanding the mechanistic basis for variability in drug disposition and response is essential if we are to move beyond the era of empirical, trial-and-error dose selection and into an age of personalized medicine that will improve outcomes in maintaining health and treating disease.
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Affiliation(s)
- Yvonne S Lin
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA.
| | - Kenneth E Thummel
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
| | - Brice D Thompson
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
| | - Rheem A Totah
- Department of Medicinal Chemistry, University of Washington, Seattle, WA, USA
| | - Christi W Cho
- Department of Medicinal Chemistry, University of Washington, Seattle, WA, USA
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8
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El-Khateeb E, Achour B, Scotcher D, Al-Majdoub ZM, Athwal V, Barber J, Rostami-Hodjegan A. Scaling Factors for Clearance in Adult Liver Cirrhosis. Drug Metab Dispos 2020; 48:1271-1282. [DOI: 10.1124/dmd.120.000152] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 09/08/2020] [Indexed: 12/23/2022] Open
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9
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Galati G, Massimo Vainieri AF, Maria Fulgenzi CA, Di Donato S, Silletta M, Gallo P, Onorato A, Vespasiani-Gentilucci U, Picardi A. Current Treatment Options for HCC: From Pharmacokinetics to Efficacy and Adverse Events in Liver Cirrhosis. Curr Drug Metab 2020; 21:866-884. [PMID: 32957880 DOI: 10.2174/1389200221999200918141239] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 06/09/2020] [Accepted: 07/27/2020] [Indexed: 12/28/2022]
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) is among the world's most common cancers. For over ten years, the only medical treatment for it has been the multikinase inhibitor Sorafenib. Currently, however, other first or second-line therapeutic options have also shown efficacy against HCC, such as multikinase inhibitors (Regorafenib, Lenvatinib, and Cabozantinib), a monoclonal antibody against the vascular endothelial growth factor receptor 2 (Ramucirumab), and immune-checkpoint inhibitors (Nivolumab, Pembrolizumab, Ipilimumab). AIM The aim of this paper is to review the metabolic pathways of drugs that have been tested for the treatment of HCC and the potential influence of liver failure over those pathways. METHODS The Food and Drug Administration (FDA)'s and European Medicines Agency (EMA)'s datasheets, results from clinical trials and observational studies have been reviewed. RESULTS This review summarizes the current knowledge regarding targets, metabolic pathways, drug interactions, and adverse events of medical treatments for HCC in cirrhotic patients. CONCLUSION The new scenario of systemic HCC therapy includes more active drugs with different metabolic pathways and different liver adverse events. Clinical and pharmacological studies providing more data on the safety of these molecules are urgently needed.
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Affiliation(s)
- Giovanni Galati
- Unit of Clinical Medicine and Hepatology, University Campus Bio-Medico, Rome, Italy
| | | | | | - Stefano Di Donato
- Unit of Clinical Medicine and Hepatology, University Campus Bio-Medico, Rome, Italy
| | | | - Paolo Gallo
- Unit of Clinical Medicine and Hepatology, University Campus Bio-Medico, Rome, Italy
| | - Angelo Onorato
- Medical Oncology Unit, University Campus Bio-Medico, Rome, Italy
| | | | - Antonio Picardi
- Unit of Clinical Medicine and Hepatology, University Campus Bio-Medico, Rome, Italy
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10
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Krens SD, Lassche G, Jansman FGA, Desar IME, Lankheet NAG, Burger DM, van Herpen CML, van Erp NP. Dose recommendations for anticancer drugs in patients with renal or hepatic impairment. Lancet Oncol 2020; 20:e200-e207. [PMID: 30942181 DOI: 10.1016/s1470-2045(19)30145-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 02/19/2019] [Accepted: 02/19/2019] [Indexed: 01/22/2023]
Abstract
Renal or hepatic impairment is a common comorbidity for patients with cancer either because of the disease itself, toxicity of previous anticancer treatments, or because of other factors affecting organ function, such as increased age. Because renal and hepatic function are among the main determinants of drug exposure, the pharmacokinetic profile might be altered for patients with cancer who have renal or hepatic impairment, necessitating dose adjustments. Most anticancer drugs are dosed near their maximum tolerated dose and are characterised by a narrow therapeutic index. Consequently, selecting an adequate dose for patients who have either hepatic or renal impairment, or both, is challenging and definitive recommendations on dose adjustments are scarce. In this Review, we discuss the effect of renal and hepatic impairment on the pharmacokinetics of anticancer drugs. To guide clinicians in selecting appropriate dose adjustments, information from available drug labels and from the published literature were combined to provide a practical set of recommendations for dose adjustments of 160 anticancer drugs for patients with hepatic and renal impairment.
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Affiliation(s)
- Stefanie D Krens
- Department of Clinical Pharmacy, Radboud University Medical Center, Nijmegen, Netherlands
| | - Gerben Lassche
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Frank G A Jansman
- Department of Pharmacy, Deventer Hospital, Deventer, Netherlands; PharmacoTherapy, Epidemiology and Economics, Groningen Research Institute of Pharmacy, University of Groningen, Groningen, Netherlands
| | - Ingrid M E Desar
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Nienke A G Lankheet
- Department of Clinical Pharmacy, Radboud University Medical Center, Nijmegen, Netherlands; Department of Clinical Pharmacy, Medisch Spectrum Twente, Enschede, Netherlands
| | - David M Burger
- Department of Clinical Pharmacy, Radboud University Medical Center, Nijmegen, Netherlands
| | - Carla M L van Herpen
- Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Nielka P van Erp
- Department of Clinical Pharmacy, Radboud University Medical Center, Nijmegen, Netherlands.
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11
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Mueller S, Luderer M, Zhang D, Meulien D, Brach BS, Schou MB. Open-label Study with Nalmefene as Needed Use in Alcohol-Dependent Patients with Evidence of Elevated Liver Stiffness and/or Hepatic Steatosis. Alcohol Alcohol 2020; 55:63-70. [PMID: 31713583 DOI: 10.1093/alcalc/agz078] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 07/10/2019] [Accepted: 08/27/2019] [Indexed: 12/19/2022] Open
Abstract
AIMS This open-label study in patients with alcohol dependence and evidence of elevated liver stiffness and/or hepatic steatosis was designed to explore the efficacy of nalmefene (18 mg) in reducing alcohol consumption and its subsequent effects on a variety of clinically relevant liver parameters. METHODS Adult patients with a diagnosis of alcohol dependence and evidence of elevated liver stiffness and/or hepatic steatosis (liver stiffness >6 kPa or controlled attenuation parameter (CAP) >215 dB/m as measured by transient elastography) were recruited at two study sites in Germany. During the 12-week treatment period, patients were instructed to take nalmefene each day they perceived a risk of drinking alcohol. RESULTS All 45 enrolled patients took at least one dose of nalmefene and 39 completed the study. After 12 weeks of study treatment with nalmefene patients showed a reduction in alcohol consumption of -13.5 days/month heavy drinking days and -45.8 g/day total alcohol consumption. Most liver parameters showed modest changes at Week 12; there was a 13% decrease in liver stiffness and 10% reduction in CAP values. Results indicated non-significant negative associations between alcohol consumption and liver stiffness and/or CAP over this 12-week study. Nalmefene was generally well tolerated, and most adverse events were mild or moderate, the most frequent being dizziness. CONCLUSIONS Patients treated with nalmefene for 12 weeks had reductions in alcohol consumption by ~50% relative to baseline and showed trends to improvement in liver stiffness and CAP.
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Affiliation(s)
- Sebastian Mueller
- Department of Medicine and Centre for Alcohol Research, Salem Medical Centre, University of Heidelberg, Zeppelinstraße 11-33, 69121 Heidelberg, Germany
| | - Mathias Luderer
- Department of Addictive Behaviour and Addiction Medicine, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J 5 68159 Mannheim, Germany.,Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Heinrich-Hoffmann-Str. 10 60528 Frankfurt/Main, Germany
| | - Doris Zhang
- H. Lundbeck A/S, Ottiliavej 9 2500 Valby Denmark
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12
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Weersink RA, Burger DM, Hayward KL, Taxis K, Drenth JP, Borgsteede SD. Safe use of medication in patients with cirrhosis: pharmacokinetic and pharmacodynamic considerations. Expert Opin Drug Metab Toxicol 2019; 16:45-57. [DOI: 10.1080/17425255.2020.1702022] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Rianne A. Weersink
- Department of Pharmacy, Unit of Pharmacotherapy, -Epidemiology and -Economics, University of Groningen, Groningen, The Netherlands
- Department of Clinical Decision Support, Health Base Foundation, Houten, The Netherlands
| | - David M. Burger
- Department of Pharmacy, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Kelly L. Hayward
- Centre for Liver Disease Research, Translational Research Institute, Faculty of Medicine, The University of Queensland, Brisbane, Australia
- Pharmacy Department, Princess Alexandra Hospital, Brisbane, Australia
| | - Katja Taxis
- Department of Pharmacy, Unit of Pharmacotherapy, -Epidemiology and -Economics, University of Groningen, Groningen, The Netherlands
| | - Joost P.H. Drenth
- Department of Gastroenterology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Sander D. Borgsteede
- Department of Clinical Decision Support, Health Base Foundation, Houten, The Netherlands
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13
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Weersink RA, Timmermans L, Monster-Simons MH, Mol PGM, Metselaar HJ, Borgsteede SD, Taxis K. Evaluation of Information in Summaries of Product Characteristics (SmPCs) on the Use of a Medicine in Patients With Hepatic Impairment. Front Pharmacol 2019; 10:1031. [PMID: 31607904 PMCID: PMC6758592 DOI: 10.3389/fphar.2019.01031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 08/12/2019] [Indexed: 12/17/2022] Open
Abstract
Background: In 2005, the European Medicines Agency (EMA) released guidance on pharmacokinetic studies in patients with hepatic impairment. This guidance describes the design of these studies and what information should be presented in the Summary of Product Characteristics (SmPC). We aim to evaluate the availability and clinical applicability of information on medicine use in patients with hepatic impairment in SmPCs and registrational dossiers of recently approved medicines. Methods: We reviewed SmPC information on use in patients with hepatic impairment of 51 new medicines authorized between 2015 and 2017. Per medicine, we assessed the availability of nine information items derived from the EMA guidance, i.e. type of hepatic disease studied; stratification by severity of hepatic impairment; influence of hepatic impairment on the pharmacokinetics; safety advice in mild, moderate, and severe hepatic impairments; and dosing recommendation in mild, moderate, and severe hepatic impairments. If unavailable, the European Public Assessment Report (EPAR) and study report were consulted consecutively. Of available items, clinical applicability was assessed by labeling information as "clear" or "ambiguous". Results: Of 51 medicines, 15 had no pharmacokinetic study in patients with hepatic impairment described in their SmPC. The other 36 SmPCs contained on average seven of the nine information items (range 4-9). One SmPC contained all 9 items, and after consulting, the study reports, 11 SmPCs were complete. The item "type of hepatic disease studied" was available in one SmPC, though it could be retrieved in 21 study reports. Regarding clinical applicability, there was no medicine with all information items available and clearly formulated in the SmPC. A total of 12 medicines (33%) contained only clearly formulated information, while 24 (67%) contained at least one ambiguously formulated information item (range 0-4). Items often ambiguously formulated were: "definition of mild, moderate, and severe hepatic impairment" (15 ambiguous SmPCs) and "safety advice in severe hepatic impairment" (17 ambiguous SmPCs). Conclusion: While SmPCs contain a large part of information requested by the EMA, clinical applicability seems low, as it is often unclear to which specific type of hepatic disease patient the advice applies. This can negatively influence the practical use by healthcare professionals.
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Affiliation(s)
- Rianne A Weersink
- Unit of Pharmacotherapy, Epidemiology & Economics, Department of Pharmacy, University of Groningen, Groningen, Netherlands.,Department of Clinical Decision Support, Health Base Foundation, Houten, Netherlands
| | - Lotte Timmermans
- Unit of Pharmacotherapy, Epidemiology & Economics, Department of Pharmacy, University of Groningen, Groningen, Netherlands.,Department of Pharmaceutical and Pharmacological Sciences, Unit of Clinical Pharmacology and Pharmacotherapy, Catholic University of Leuven, Leuven, Belgium
| | - Margje H Monster-Simons
- Dutch Medicines Evaluation Board (CBG-MEB), Utrecht, Netherlands.,Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands
| | - Peter G M Mol
- Dutch Medicines Evaluation Board (CBG-MEB), Utrecht, Netherlands.,Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands
| | - Herold J Metselaar
- Department of Gastroenterology and Hepatology, Erasmus University Medical Centre, Rotterdam, Netherlands
| | - Sander D Borgsteede
- Department of Clinical Decision Support, Health Base Foundation, Houten, Netherlands.,Department of Hospital Pharmacy, Erasmus University Medical Centre, Rotterdam, Netherlands
| | - Katja Taxis
- Unit of Pharmacotherapy, Epidemiology & Economics, Department of Pharmacy, University of Groningen, Groningen, Netherlands
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14
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Kempker RR, Alghamdi WA, Al-Shaer MH, Burch G, Peloquin CA. A Pharmacology Perspective of Simultaneous Tuberculosis and Hepatitis C Treatment. Antimicrob Agents Chemother 2019; 63:AAC.01215-19. [PMID: 31591118 PMCID: PMC6879218 DOI: 10.1128/aac.01215-19] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Tuberculosis (TB) and hepatitis C virus (HCV) infection are both major public health problems. Despite high rates of co-infection there is scarce literature addressing the convergence of the two diseases. One particularly unexplored area is the potential for simultaneous treatment of TB and HCV which would allow for leveraging an extensive global TB treatment infrastructure to help scale up HCV treatment. We review the drug metabolism of anti-TB and HCV drugs and the known and potential drug-drug interactions between recommended HCV regimens and individual anti-TB drugs. Rifampin is the only anti-TB drug to have been formally studied for potential drug interactions with anti-HCV direct-acting antivirals (DAAs) and existing data precludes these combinations. However, based on known pathways of drug metabolism and enzyme effects, the combination of HCV DAA regimens with all other anti-TB drugs may be feasible. Pharmacokinetic studies are needed next to help move co treatment regimens forward for clinical use among patients coinfected with TB and HCV.
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Affiliation(s)
- Russell R Kempker
- Division of Infectious Diseases Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA.
| | - Wael A Alghamdi
- Department of Clinical Pharmacy, College of Pharmacy, King Khalid University, Abha, Saudi Arabia
| | - Mohammad H Al-Shaer
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Gainesville, FL, USA
| | - Gena Burch
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Gainesville, FL, USA
| | - Charles A Peloquin
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Gainesville, FL, USA
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15
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Alcohol Interaction with Cocaine, Methamphetamine, Opioids, Nicotine, Cannabis, and γ-Hydroxybutyric Acid. Biomedicines 2019; 7:biomedicines7010016. [PMID: 30866524 PMCID: PMC6466217 DOI: 10.3390/biomedicines7010016] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 02/21/2019] [Accepted: 02/27/2019] [Indexed: 12/18/2022] Open
Abstract
Millions of people around the world drink alcoholic beverages to cope with the stress of modern lifestyle. Although moderate alcohol drinking may have some relaxing and euphoric effects, uncontrolled drinking exacerbates the problems associated with alcohol abuse that are exploding in quantity and intensity in the United States and around the world. Recently, mixing of alcohol with other drugs of abuse (such as opioids, cocaine, methamphetamine, nicotine, cannabis, and γ-hydroxybutyric acid) and medications has become an emerging trend, exacerbating the public health concerns. Mixing of alcohol with other drugs may additively or synergistically augment the seriousness of the adverse effects such as the withdrawal symptoms, cardiovascular disorders, liver damage, reproductive abnormalities, and behavioral abnormalities. Despite the seriousness of the situation, possible mechanisms underlying the interactions is not yet understood. This has been one of the key hindrances in developing effective treatments. Therefore, the aim of this article is to review the consequences of alcohol's interaction with other drugs and decipher the underlying mechanisms.
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16
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Population Pharmacokinetics and Dosing Optimization of Azithromycin in Children with Community-Acquired Pneumonia. Antimicrob Agents Chemother 2018; 62:AAC.00686-18. [PMID: 29941652 DOI: 10.1128/aac.00686-18] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 06/20/2018] [Indexed: 12/30/2022] Open
Abstract
Azithromycin is extensively used in children with community-acquired pneumonia (CAP). Currently, the intravenous azithromycin is used off-label in children partly due to lacking of pharmacokinetic data. Our objective was to evaluate the population pharmacokinetics (PPK) and optimize dose strategy in order to improve treatment in this distinctive population. This was a prospective, multicenter, open-labeled pharmacokinetic study. Blood samples were collected from hospitalized pediatric patients and concentrations were determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS). PPK analysis was conducted using NONMEM software. The pharmacokinetic data from 95 pediatric patients (age range, 2.1 to 11.7 years) were available for analysis. The PPK was best fitted by a two-compartment model with linear elimination. Covariate analysis verified that body weight and alanine aminotransferase (ALT) had significant effects on azithromycin pharmacokinetics, yielding a 24% decrease of clearance in patients with ALT of >40. Monte Carlo simulation showed that for children with normal liver function, a loading-dose strategy (a loading dose of 15 mg/kg of body weight followed by maintenance doses of 10 mg/kg) would achieve the ratio of the area under free drug plasma concentration-time curve over 24 h (fAUC) to MIC90 (fAUC/MIC) target of 3 h in 53.2% of hypothetical patients, using a normative MIC susceptibility breakpoint of 2 mg/liter. For children with ALT of >40, the proposed dose needed to decrease by 15% to achieve comparable exposure. The corresponding risk of overdose for the recommended dosing regimen was less than 5.8%. In conclusion, the PPK of azithromycin was evaluated in children with CAP and an optimal dosing regimen was constructed based on developmental pharmacokinetic-pharmacodynamic modeling and simulation.
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17
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Management of hyperbilirubinaemia in pancreatic cancer patients. Eur J Cancer 2018; 94:26-36. [DOI: 10.1016/j.ejca.2018.01.078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 01/12/2018] [Accepted: 01/18/2018] [Indexed: 12/15/2022]
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18
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Diep U, Chudow M, Sunjic KM. Pharmacokinetic Changes in Liver Failure and Impact on Drug Therapy. AACN Adv Crit Care 2018; 28:93-101. [PMID: 28592464 DOI: 10.4037/aacnacc2017948] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Uyen Diep
- Uyen Diep is Critical Care Clinical Pharmacist, Department of Pharmacy Services, Tampa General Hospital, Tampa, FL 33601 . Melissa Chudow is Assistant Professor, Department of Pharmacotherapeutics and Clinical Research, University of South Florida College of Pharmacy, Tampa, Florida. Katlynd M. Sunjic is Assistant Professor, Department of Pharmacotherapeutics and Clinical Research, University of South Florida College of Pharmacy, Tampa, Florida
| | - Melissa Chudow
- Uyen Diep is Critical Care Clinical Pharmacist, Department of Pharmacy Services, Tampa General Hospital, Tampa, FL 33601 . Melissa Chudow is Assistant Professor, Department of Pharmacotherapeutics and Clinical Research, University of South Florida College of Pharmacy, Tampa, Florida. Katlynd M. Sunjic is Assistant Professor, Department of Pharmacotherapeutics and Clinical Research, University of South Florida College of Pharmacy, Tampa, Florida
| | - Katlynd M Sunjic
- Uyen Diep is Critical Care Clinical Pharmacist, Department of Pharmacy Services, Tampa General Hospital, Tampa, FL 33601 . Melissa Chudow is Assistant Professor, Department of Pharmacotherapeutics and Clinical Research, University of South Florida College of Pharmacy, Tampa, Florida. Katlynd M. Sunjic is Assistant Professor, Department of Pharmacotherapeutics and Clinical Research, University of South Florida College of Pharmacy, Tampa, Florida
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19
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Masman AD, Tibboel D, Baar FPM, van Dijk M, Mathot RAA, van Gelder T. Prevalence and Implications of Abnormal Laboratory Results in Patients in the Terminal Phase of Life. J Palliat Med 2018; 19:822-9. [PMID: 27494223 DOI: 10.1089/jpm.2015.0548] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Pathophysiological changes at the end of life may affect pharmacokinetics of drugs. However, caregivers typically do not extensively monitor patients' laboratory parameters at the end of life. OBJECTIVE Our aim was to describe laboratory parameters of hospice patients in the week before death. METHODS A cohort study was conducted on available laboratory results in the week before death, including clinical chemistry and hematology tests. RESULTS Laboratory data of 125 patients in a palliative care center were included, assessed at a median of 3 days before death. Eighty percent of patients had anemia and almost all had hypoalbuminemia (97%). Elevated levels of gamma-glutamyl transferase (gGT) were found in 75%, of alkaline phosphatase (ALP) in 60%, of aspartate aminotransferase (ASAT) in 60%, and of calcium (Ca) in 68%. Alanine aminotransferase (ALAT), bilirubin, sodium (Na), and potassium (K) were abnormal in from 8.8% to 36.0% of patients. A previous unknown poor kidney function was found in 60% of patients. Thirteen patients (22%) with a regular morphine prescription and one patient treated with a non-steroidal anti-inflammatory drug (NSAID) had severe kidney failure. CONCLUSIONS Abnormal laboratory results were expected due to the pathophysiological changes that occur during the last phase of life. Remarkably, however, electrolytes (Na and K) were balanced even shortly before death. Estimated glomerular filtration rate (eGFR), reflecting the kidney function, seems the most clinically relevant laboratory parameter, because it may guide drug choice and dosing.
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Affiliation(s)
- Anniek D Masman
- 1 Palliative Care Centre , Laurens Cadenza, Rotterdam, the Netherlands .,2 Pain Expertise Centre, Erasmus MC-Sophia Children's Hospital , Rotterdam, the Netherlands
| | - Dick Tibboel
- 2 Pain Expertise Centre, Erasmus MC-Sophia Children's Hospital , Rotterdam, the Netherlands .,3 Intensive Care, Department of Paediatric Surgery, Erasmus MC-Sophia Children's Hospital , Rotterdam, the Netherlands
| | - Frans P M Baar
- 1 Palliative Care Centre , Laurens Cadenza, Rotterdam, the Netherlands .,2 Pain Expertise Centre, Erasmus MC-Sophia Children's Hospital , Rotterdam, the Netherlands
| | - Monique van Dijk
- 2 Pain Expertise Centre, Erasmus MC-Sophia Children's Hospital , Rotterdam, the Netherlands .,3 Intensive Care, Department of Paediatric Surgery, Erasmus MC-Sophia Children's Hospital , Rotterdam, the Netherlands
| | - Ron A A Mathot
- 4 Hospital Pharmacy-Clinical Pharmacology , Academic Medical Centre, Amsterdam, the Netherlands
| | - Teun van Gelder
- 5 Department of Hospital Pharmacy, Erasmus Medical Centre , Rotterdam, the Netherlands
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20
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Haimerl M, Fuhrmann I, Poelsterl S, Fellner C, Nickel MD, Weigand K, Dahlke MH, Verloh N, Stroszczynski C, Wiggermann P. Gd-EOB-DTPA-enhanced T1 relaxometry for assessment of liver function determined by real-time 13C-methacetin breath test. Eur Radiol 2018. [PMID: 29532241 DOI: 10.1007/s00330-018-5337-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVES To determine whether liver function as determined by intravenous administration of 13C-methacetin and continuous real-time breath analysis can be estimated quantitatively from gadoxetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance (MR) relaxometry. METHODS Sixty-six patients underwent a 13C-methacetin breath test (13C-MBT) for evaluation of liver function and Gd-EOB-DTPA-enhanced T1-relaxometry at 3 T. A transverse 3D VIBE sequence with an inline T1 calculation based on variable flip angles was acquired prior to (T1 pre) and 20 min post-Gd-EOB-DTPA (T1 post) administration. The reduction rate of T1 relaxation time (rrT1) and T1 relaxation velocity index (∆R1) between pre- and post-contrast images was evaluated. 13C-MBT values were correlated with T1post, ∆R1 and rrT1, providing an MRI-based estimated 13C-MBT value. The interobserver reliability was assessed by determining the intraclass correlation coefficient (ICC). RESULTS Stratified by three different categories of 13C-MBT readouts, there was a constant increase of T1 post with increasing progression of diminished liver function (p ≤ 0.030) and a constant significant decrease of ∆R1 (p ≤ 0.025) and rrT1 (p < 0.018) with progression of liver damage as assessed by 13C-methacetin breath analysis. ICC for all T1 relaxation values and indices was excellent (> 0.88). A simple regression model showed a log-linear correlation of 13C-MBT values with T1post (r = 0.57; p < 0.001), ∆R1 (r = 0.59; p < 0.001) and rrT1 (r = 0.70; p < 0.001). CONCLUSION Liver function as determined using real-time 13C-methacetin breath analysis can be estimated quantitatively from Gd-EOB-DTPA-enhanced MR relaxometry. KEY POINTS • Gd-EOB-DTPA-enhanced T1 relaxometry quantifies liver function • Gd-EOB-DTPA-enhanced MR relaxometry may provide parameters for assessing liver function before surgery • Gd-EOB-DTPA-enhanced MR relaxometry may be useful for monitoring liver disease progression • Gd-EOB-DTPA-enhanced MR relaxometry has the potential to become a novel liver function index.
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Affiliation(s)
- Michael Haimerl
- Department of Radiology, University Hospital Regensburg, 93042, Regensburg, Germany.
| | - Irene Fuhrmann
- Department of Radiology, University Hospital Regensburg, 93042, Regensburg, Germany
| | - Stefanie Poelsterl
- Department of Radiology, University Hospital Regensburg, 93042, Regensburg, Germany
| | - Claudia Fellner
- Department of Radiology, University Hospital Regensburg, 93042, Regensburg, Germany
| | - Marcel D Nickel
- MR Applications Predevelopment, Siemens Healthcare GmbH, Erlangen, Germany
| | - Kilian Weigand
- Department of Internal Medicine I, University Hospital Regensburg, Regensburg, Germany
| | - Marc H Dahlke
- Department of Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Niklas Verloh
- Department of Radiology, University Hospital Regensburg, 93042, Regensburg, Germany
| | | | - Philipp Wiggermann
- Department of Radiology, University Hospital Regensburg, 93042, Regensburg, Germany
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21
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Uji M, Yokoyama Y, Ohbuchi K, Tsuchiya K, Sadakane C, Shimobori C, Yamamoto M, Nagino M. Exploration of serum biomarkers for predicting the response to Inchinkoto (ICKT), a Japanese traditional herbal medicine. Metabolomics 2017; 13:155. [PMID: 31375927 PMCID: PMC6153689 DOI: 10.1007/s11306-017-1292-x] [Citation(s) in RCA: 7] [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: 07/29/2017] [Accepted: 10/31/2017] [Indexed: 12/24/2022]
Abstract
INTRODUCTION In patients with obstructive jaundice, biliary drainage sometimes fails to result in improvement. A pharmaceutical-grade choleretic herbal medicine, Inchinkoto (ICKT), has been proposed to exert auxiliary effects on biliary drainage; however, its effects are variable among patients. OBJECTIVES The aim of this study is to explore serum biomarkers that are associated with pharmaceutical efficacy of ICKT. METHODS Obstructive jaundice patients who underwent external biliary decompression were enrolled (n = 37). ICKT was given orally 3 times a day at daily dose of 7.5 g. Serum and bile samples were collected before, 3 h after, and 24 h after ICKT administration. The concentrations of total bilirubin, direct bilirubin, and total bile acid in bile specimens were measured. Metabolites in serum samples were comprehensively profiled using LC-MS/MS and GC-MS/MS. Pharmacokinetic analysis of major ICKT components was also performed. RESULTS ICKT administration significantly decreased serum ALT and increased bile volume after 24 h. The serum concentrations of ICKT components were not well correlated with the efficacy of ICKT. However, the ratio of 2-hydroxyisobutyric acid to arachidonic acid and the ratio of glutaric acid to niacinamide, exhibited good performance as biomarkers for the efficacy of ICKT on bile flow and ALT, respectively. Additionally, comprehensive correlation analysis revealed that serum glucuronic acid was highly correlated with serum total bilirubin, suggesting that this metabolite may be deeply involved in the pathogenesis of jaundice. CONCLUSIONS The present study indicates that ICKT is efficacious and provides candidates for predicting ICKT efficacy. Further validation studies are warranted.
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Affiliation(s)
- Masahito Uji
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan
| | - Yukihiro Yokoyama
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan.
| | | | | | | | | | | | - Masato Nagino
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Japan
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Abstract
Drug-induced liver injury (DILI) remains a significant clinical challenge and is the leading cause of acute liver failure in most countries. An aging population that uses more medications, a constant influx of newly developed drugs and a growing risk from unfamiliar herbal and dietary supplements will make DILI an increasing part of clinical practice. Currently, the most effective strategy for disease management is rapid identification, withholding the inciting agents, supportive care and having a firm understanding of the expected natural history. There are resources available to aid the clinician, including a new online "textbook" as well as causality assessment tools, but a heightened awareness of risk and the disease's varying phenotypes and good history-taking remain cornerstones to diagnosis. Looking ahead, growing registries of cases, pharmacoepidemiology studies and translational research into the mechanisms of injury may produce better diagnostic tools, markers for risk and disease, and prevention and therapeutics.
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Affiliation(s)
- Tanvir Haque
- Department of Medicine and Division of Gastroenterology and Hepatology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - Eizaburo Sasatomi
- Department of Pathology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - Paul H Hayashi
- Department of Medicine and Division of Gastroenterology and Hepatology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
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Optimizing the Clinical Use of Carvedilol in Liver Cirrhosis Using a Physiologically Based Pharmacokinetic Modeling Approach. Eur J Drug Metab Pharmacokinet 2016; 42:383-396. [DOI: 10.1007/s13318-016-0353-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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24
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Franken LG, de Winter BCM, van Esch HJ, van Zuylen L, Baar FPM, Tibboel D, Mathôt RAA, van Gelder T, Koch BCP. Pharmacokinetic considerations and recommendations in palliative care, with focus on morphine, midazolam and haloperidol. Expert Opin Drug Metab Toxicol 2016; 12:669-80. [PMID: 27081769 DOI: 10.1080/17425255.2016.1179281] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION A variety of medications are used for symptom control in palliative care, such as morphine, midazolam and haloperidol. The pharmacokinetics of these drugs may be altered in these patients as a result of physiological changes that occur at the end stage of life. AREAS COVERED This review gives an overview of how the pharmacokinetics in terminally ill patients may differ from the average population and discusses the effect of terminal illness on each of the four pharmacokinetic processes absorption, distribution, metabolism, and elimination. Specific considerations are also given for three commonly prescribed drugs in palliative care: morphine, midazolam and haloperidol). EXPERT OPINION The pharmacokinetics of drugs in terminally ill patients can be complex and limited evidence exists on guided drug use in this population. To improve the quality of life of these patients, more knowledge and more pharmacokinetic/pharmacodynamics studies in terminally ill patients are needed to develop individualised dosing guidelines. Until then knowledge of pharmacokinetics and the physiological changes that occur in the final days of life can provide a base for dosing adjustments that will improve the quality of life of terminally ill patients. As the interaction of drugs with the physiology of dying is complex, pharmacological treatment is probably best assessed in a multi-disciplinary setting and the advice of a pharmacist, or clinical pharmacologist, is highly recommended.
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Affiliation(s)
- L G Franken
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
| | - B C M de Winter
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
| | - H J van Esch
- b Palliative Care Centre , Laurens Cadenza , Rotterdam , the Netherlands
| | - L van Zuylen
- c Department of Medical Oncology , Erasmus MC Cancer Institute , Rotterdam , the Netherlands
| | - F P M Baar
- b Palliative Care Centre , Laurens Cadenza , Rotterdam , the Netherlands
| | - D Tibboel
- d Intensive Care, Department of Paediatric Surgery , Erasmus MC-Sophia Children's Hospital , Rotterdam , the Netherlands.,e Pain Expertise Centre , Erasmus MC-Sophia Children's Hospital , Rotterdam , the Netherlands
| | - R A A Mathôt
- f Hospital Pharmacy - Clinical Pharmacology , Academic Medical Centre , Amsterdam , the Netherlands
| | - T van Gelder
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
| | - B C P Koch
- a Department of Hospital Pharmacy , Erasmus Medical Centre , Rotterdam , the Netherlands
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El-Lakkany NM, Hendawy AS, Seif El-Din SH, Ashour AA, Atta R, Abdel-Aziz AAH, Mansour AM, Botros SS. Bioavailability of paracetamol with/without caffeine in Egyptian patients with hepatitis C virus. Eur J Clin Pharmacol 2016; 72:573-82. [PMID: 26888096 DOI: 10.1007/s00228-016-2025-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 02/09/2016] [Indexed: 10/22/2022]
Abstract
PURPOSE This study investigates the involvement of liver dysfunction in the modulation of paracetamol pharmacokinetic profile in genotype-4 HCV patients treated with either paracetamol alone (Para) or in combination with caffeine (Para-Caf). METHODS Twenty healthy volunteers and 20 Child-Pugh B HCV patients, each divided into two equal subgroups, were examined, whose liver/kidney functions were correlated with their main clinical manifestation. After an overnight fasting, healthy and hepatic subjects received either a single dose of Para (1000 mg paracetamol) or Para-Caf (1000 mg paracetamol/130 mg caffeine). Two milliliters of saliva samples were collected prior to and at different time-intervals after drug administration and analyzed using HPLC. RESULTS There was a noticeable increase in the mean concentration time profile of salivary paracetamol concentrations in hepatic patients, with concomitant decrease in paracetamol clearance (CLT), along with induction in the primary pharmacokinetic (PK) parameters, C max, AUC(0-8 h) and AUC(0-∞) (by about 95, 82, and 64 %, respectively, after treatment with Para, and 98, 96, and 101 %, respectively, after treatment with Para-Caf), when compared with the corresponding parameters in healthy subjects. Additionally, the healthy subjects treated with Para-Caf exhibited bioinequivalent increase in C max, K a, and t 1/2 with decrease in T max when compared with the healthy individuals treated with Para alone. A similar pattern was recorded in hepatic patients after addition of caffeine to paracetamol, with even augmented significant increase in K a and t 1/2 (by 100 and 32 %, respectively). CONCLUSIONS Liver dysfunction modified the PK of paracetamol expressed as earlier effective paracetamol concentration, with obvious decrease in its clearance. Caffeine induced faster absorption (evidenced by shorter T max and higher K a) and prolonged t 1/2 of paracetamol, the effects that were more profound in hepatic patients. Further studies are needed to evaluate the influence of liver damage on paracetamol pharmacokinetics whenever repeated dosing is applied, to avoid possible drug accumulation.
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Affiliation(s)
- Naglaa M El-Lakkany
- Department of Pharmacology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba, P.O. Box 30, Giza, 12411, Egypt.
| | - Ahmed S Hendawy
- Department of Pharmacology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba, P.O. Box 30, Giza, 12411, Egypt
| | - Sayed H Seif El-Din
- Department of Pharmacology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba, P.O. Box 30, Giza, 12411, Egypt
| | - Ahmed A Ashour
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Nasr city, Cairo, Egypt
| | - Raafat Atta
- Department of Hepatogastroenterology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba, P.O. Box 30, Giza, 12411, Egypt
| | - Abdel-Aziz H Abdel-Aziz
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Nasr city, Cairo, Egypt
| | - Ahmed M Mansour
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Nasr city, Cairo, Egypt
| | - Sanaa S Botros
- Department of Pharmacology, Theodor Bilharz Research Institute, Warak El-Hadar, Imbaba, P.O. Box 30, Giza, 12411, Egypt
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Affiliation(s)
| | - Sarah N Hilmer
- Royal North Shore Hospital, and Sydney Medical School; The University of Sydney; Sydney New South Wales
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27
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Affiliation(s)
- Jenana Halilovic
- Infectious Diseases, Department of Pharmaceutical Services, University of California Davis Health System, Sacramento
| | - Brett H. Heintz
- Internal Medicine and Infectious Diseases, Department of Pharmaceutical Services, Iowa City Veterans Affairs Healthcare System
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Lawendy N, Lamba M, Chan G, Wang R, Alvey CW, Krishnaswami S. The effect of mild and moderate hepatic impairment on the pharmacokinetics of tofacitinib, an orally active Janus kinase inhibitor. Clin Pharmacol Drug Dev 2014; 3:421-7. [PMID: 27129117 DOI: 10.1002/cpdd.143] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Accepted: 07/02/2014] [Indexed: 12/13/2022]
Abstract
Tofacitinib is an oral Janus kinase inhibitor for the treatment of rheumatoid arthritis. We report here an evaluation of the pharmacokinetics of a single 10 mg dose of tofacitinib in healthy volunteers (n = 6) and subjects with mild (n = 6) or moderate (n = 6) hepatic impairment. Compared to healthy volunteers, tofacitinib area under the plasma concentration-time profile from time 0 to infinity (AUCinf ) and maximum observed concentration (Cmax ) in subjects with mild hepatic impairment were not altered. In subjects with moderate hepatic impairment, the geometric mean AUCinf and Cmax of tofacitinib were increased (90% confidence intervals of percentage increase) by approximately 65% (25%, 117%) and 49% (12%, 97%), respectively. A single dose of tofacitinib 10 mg resulted in two treatment-emergent adverse events (AE) in the mild hepatic impairment group, and one in the moderate hepatic impairment group; they were not considered related to study treatment. There were no deaths, serious AEs, discontinuations due to AEs, or dose reductions due to AEs. Data from this study were critical to deriving dose adjustments for subjects with hepatic impairment.
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De Martin S, Gabbia D, Albertin G, Sfriso MM, Mescoli C, Albertoni L, Paliuri G, Bova S, Palatini P. Differential effect of liver cirrhosis on the pregnane X receptor-mediated induction of CYP3A1 and 3A2 in the rat. Drug Metab Dispos 2014; 42:1617-26. [PMID: 25030308 DOI: 10.1124/dmd.114.058511] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Conflicting results have been obtained by clinical studies investigating the effect of liver cirrhosis on enzyme induction. Because ethical concerns do not give consent for methodologically rigorous studies in humans, we addressed this question by examining the effect of the prototypical inducer dexamethasone (DEX) on the pregnane X receptor (PXR)-mediated induction of CYP3A1 and 3A2 in a validated animal model of liver cirrhosis obtained by exposure of rats to carbon tetrachloride. For this purpose, we assessed mRNA levels, protein expressions, and enzymatic activities of both CYP3A enzymes, as well as mRNA and protein expressions of PXR in rat populations rigorously stratified according to the severity of liver insufficiency. Constitutive mRNA and protein expressions of CYP3A1 and CYP3A2 and their basal enzyme activities were not affected by liver dysfunction. DEX treatment markedly increased steady-state mRNA level, protein content, and enzymatic activity of CYP3A1 in healthy and cirrhotic rats, irrespective of the degree of liver dysfunction. On the contrary, the inducing effect of DEX on gene and protein expressions and enzyme activity of CYP3A2 was preserved in moderate liver insufficiency, whereas it was greatly curtailed when liver insufficiency became severe. mRNA and protein expressions of PXR were neither reduced by liver dysfunction nor increased by DEX treatment. These results indicate that even the inducibility of cytochrome P450 isoforms under the transcriptional control of the same nuclear receptor may be differentially affected by cirrhosis and may partly explain why conflicting results were obtained by human studies.
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Affiliation(s)
- Sara De Martin
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Daniela Gabbia
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Giovanna Albertin
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Maria Martina Sfriso
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Claudia Mescoli
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Laura Albertoni
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Giovanna Paliuri
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Sergio Bova
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
| | - Pietro Palatini
- Department of Pharmaceutical and Pharmacological Sciences (S.D.M., D.G., G.P., S.B., P.P.), Department of Molecular Medicine, Section of Anatomy (G.A., M.M.S.), and Department of Medicine, Surgical Pathology and Cytopathology Unit (C.M., L.A.), University of Padova, Padova, Italy
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Taegtmeyer AB, Haschke M, Tchambaz L, Buylaert M, Tschöpl M, Beuers U, Drewe J, Krähenbühl S. A study of the relationship between serum bile acids and propranolol pharmacokinetics and pharmacodynamics in patients with liver cirrhosis and in healthy controls. PLoS One 2014; 9:e97885. [PMID: 24906133 PMCID: PMC4048194 DOI: 10.1371/journal.pone.0097885] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 04/25/2014] [Indexed: 12/18/2022] Open
Abstract
The main objectives of the study were to determine the exposure and bioavailability of oral propranolol and to investigate their associations with serum bile acid concentration in patients with liver cirrhosis and in healthy controls. A further objective was to study the pharmacodynamics of propranolol. An open-label crossover study was performed to determine the pharmacokinetics and pharmacodynamics of propranolol after oral (40 mg) and intravenous (1 mg) administration as well as the concentration of total and individual fasting serum bile acids in 15 patients with liver cirrhosis and 5 healthy controls. After intravenous propranolol, patients showed a 1.8-fold increase in the area under the plasma concentration-time curve (AUC0–∞), a 1.8-fold increase in volume of distribution and a 3-fold increase in the elimination half-life (mean ± SEM: 641±100 vs. 205±43 minutes) compared to controls. After oral application, AUC0–∞ and elimination half-life of propranolol were increased 6- and 4-fold, respectively, and bioavailability 3-fold (83±8 vs. 27±9.2%). Maximal effects on blood pressure and heart rate occurred during the first 4 and first 2 hours, respectively, after intravenous and oral application in both patients and controls. Total serum bile acid concentrations were higher in patients than controls (42±11 vs. 2.7±0.3 µmol/L) and were linearly correlated with the serum chenodeoxycholic acid concentration. There was a linear correlation between the SBA concentration and propranolol oral AUC0–∞ in subjects not receiving interacting drugs (r2 = 0.73, n = 18). The bioavailability of and exposure to oral propranolol are increased in patients with cirrhosis. Fasting serum bile acid concentration may be helpful in predicting the exposure to oral propranolol in these patients.
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Affiliation(s)
- Anne B. Taegtmeyer
- Division of Clinical Pharmacology & Toxicology, University and University Hospital Basel, Basel, Switzerland
| | - Manuel Haschke
- Division of Clinical Pharmacology & Toxicology, University and University Hospital Basel, Basel, Switzerland
- Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Lydia Tchambaz
- Division of Clinical Pharmacology & Toxicology, University and University Hospital Basel, Basel, Switzerland
| | - Mirabel Buylaert
- Division of Clinical Pharmacology & Toxicology, University and University Hospital Basel, Basel, Switzerland
| | - Martin Tschöpl
- Division of Clinical Pharmacology & Toxicology, University and University Hospital Basel, Basel, Switzerland
| | - Ulrich Beuers
- Department of Gastroenterology & Hepatology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Jürgen Drewe
- Division of Clinical Pharmacology & Toxicology, University and University Hospital Basel, Basel, Switzerland
- Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Stephan Krähenbühl
- Division of Clinical Pharmacology & Toxicology, University and University Hospital Basel, Basel, Switzerland
- Department of Biomedicine, University of Basel, Basel, Switzerland
- * E-mail:
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Abstract
Patients with mental illness often have co-occurring substance abuse which increases the risk for developing cirrhosis, particularly with common etiologies such as hepatitis and alcoholic liver disease. As such, knowledge of how the disease may impact medication prescribing is important. Unfortunately, there is a paucity of data to guide medication prescribing in these patients. Product labeling information should be used in the clinical decision making process. Additionally, clinicians should consider the etiology of disease, adverse effect profile, and pharmacokinetic parameters including solubility, product formulation, protein binding, hydrophilicity, metabolism, bioavailability, extraction ratios, excretion route, and half-life. Thoughtful consideration should be given when prescribing potentially hepatotoxic medications, and those which may increase bleeding risk in patients with coagulopathy. It is essential to ensure every medication has an appropriate indication and carefully evaluate the need for each medication. Overall, more research is necessary to support clinical decision-making with outcomes based research in patients with chronic liver disease.
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Affiliation(s)
- Kristen N. Gardner
- PGY-1 Pharmacy Practice Resident, University of North Carolina Hospitals and Clinics, Chapel Hill, NC, University of North Carolina Eshelman School of Pharmacy, Chapel Hill, NC
| | - Jolene R. Bostwick
- Clinical Associate Professor of Pharmacy, Department of Clinical, Social, and Administrative Services, University of Michigan College of Pharmacy, Clinical Pharmacist, Adult Psychiatry, University of Michigan Health System
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32
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Pagani L. Rejuvenating aminoglycosides usage in geriatric patients with gram-negative infections. Eur Geriatr Med 2014. [DOI: 10.1016/j.eurger.2014.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Abstract
The efficacy, safety, and tolerability of drugs are dependent on numerous factors that influence their disposition. A dose that is efficacious and safe for one individual may result in sub-therapeutic or toxic blood concentrations in other individuals. A major source of this variability in drug response is drug metabolism, where differences in pre-systemic and systemic biotransformation efficiency result in variable degrees of systemic exposure (e.g., AUC, C max, and/or C min) following administration of a fixed dose.Interindividual differences in drug biotransformation have been studied extensively. It is well recognized that both intrinsic (such as genetics, age, sex, and disease states) and extrinsic (such as diet, chemical exposures from the environment, and even sunlight) factors play a significant role. For the family of cytochrome P450 enzymes, the most critical of the drug metabolizing enzymes, genetic variation can result in the complete absence or enhanced expression of a functional enzyme. In addition, up- and down-regulation of gene expression, in response to an altered cellular environment, can achieve the same range of metabolic function (phenotype), but often in a less reliably predictable and time-dependent manner. Understanding the mechanistic basis for drug disposition and response variability is essential if we are to move beyond the era of empirical, trial-and-error dose selection and into an age of personalized medicine that brings with it true improvements in health outcomes in the therapeutic treatment of disease.
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Affiliation(s)
- Kenneth E Thummel
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
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Should the dosage of controlled-release oxycodone in advanced cancer be modified on the basis of patient characteristics? Support Care Cancer 2013; 22:325-30. [DOI: 10.1007/s00520-013-1973-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Accepted: 09/05/2013] [Indexed: 10/26/2022]
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Relationship between differential hepatic microRNA expression and decreased hepatic cytochrome P450 3A activity in cirrhosis. PLoS One 2013; 8:e74471. [PMID: 24058572 PMCID: PMC3772944 DOI: 10.1371/journal.pone.0074471] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 07/31/2013] [Indexed: 12/17/2022] Open
Abstract
Background and Aim Liver cirrhosis is associated with decreased hepatic cytochrome P4503A (CYP3A) activity but the pathogenesis of this phenomenon is not well elucidated. In this study, we examined if certain microRNAs (miRNA) are associated with decreased hepatic CYP3A activity in cirrhosis. Methods Hepatic CYP3A activity and miRNA microarray expression profiles were measured in cirrhotic (n=28) and normal (n=12) liver tissue. Hepatic CYP3A activity was measured via midazolam hydroxylation in human liver microsomes. Additionally, hepatic CYP3A4 protein concentration and the expression of CYP3A4 mRNA were measured. Analyses were conducted to identify miRNAs which were differentially expressed between two groups but also were significantly associated with lower hepatic CYP3A activity. Results Hepatic CYP3A activity in cirrhotic livers was 1.7-fold lower than in the normal livers (0.28 ± 0.06 vs. 0.47 ± 0.07mL* min-1*mg protein-1 (mean ± SEM), P=0.02). Six microRNAs (miR-155, miR-454, miR-582-5p, let-7f-1*, miR-181d, and miR-500) had >1.2-fold increase in cirrhotic livers and also had significant negative correlation with hepatic CYP3A activity (range of r = -0.44 to -0.52, P <0.05). Notably, miR-155, a known regulator of liver inflammation, had the highest fold increase in cirrhotic livers (2.2-fold, P=4.16E-08) and significantly correlated with hepatic CYP3A activity (r=-0.50, P=0.017). The relative expression (2-ΔΔCt mean ± SEM) of hepatic CYP3A4 mRNA was significantly higher in cirrhotic livers (21.76 ± 2.65 vs. 5.91 ± 1.29, P=2.04E-07) but their levels did not significantly correlate with hepatic CYP3A activity (r=-0.43, P=0.08). Conclusion The strong association between certain miRNAs, notably miR-155, and lower hepatic CYP3A activity suggest that altered miRNA expression may regulate hepatic CYP3A activity.
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Anticoagulant therapy with the oral direct factor Xa inhibitors rivaroxaban, apixaban and edoxaban and the thrombin inhibitor dabigatran etexilate in patients with hepatic impairment. Clin Pharmacokinet 2013; 52:243-54. [PMID: 23389892 DOI: 10.1007/s40262-013-0034-0] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The direct factor Xa (FXa) inhibitors rivaroxaban, apixaban and edoxaban, and the thrombin inhibitor dabigatran etexilate (dabigatran) have gained approval for use in several indications, most notably for the prevention and treatment of venous thromboembolism (VTE) and for the prevention of stroke in patients with atrial fibrillation. Hepatic impairment can affect the disposition of these anticoagulants considerably not only because of the hepatic metabolism of the direct FXa inhibitors but also because moderate to severely impaired hepatic function will affect coagulation. This review describes the key pharmacological properties of novel oral anticoagulants with special attention to patients with impaired hepatic function. In subjects with moderately impaired liver function (i.e. Child-Pugh classification B), the area under the plasma concentration-time curve (AUC) of rivaroxaban (10 mg single dose) is increased by 2.27-fold, which is paralleled by an increase in FXa inhibition. The AUC of apixaban (5 mg single dose) is increased by 1.09-fold, whereas the AUC of edoxaban (15 mg single dose) is decreased by 4.8 % and the AUC of dabigatran (150 mg single dose) is decreased by 5.6 %. Specific labelling restrictions for rivaroxaban, apixaban and dabigatran regarding impaired hepatic function are based on both the Child-Pugh classification and liver-related exclusion criteria applied in pivotal clinical trials. Rivaroxaban is contraindicated in patients with hepatic disease associated with coagulopathy and clinically relevant bleeding risk, including cirrhotic patients classified as Child-Pugh B and C. Apixaban can be used with caution in patients with mild (Child-Pugh A) or moderate (Child-Pugh B) hepatic impairment or in patients with alanine aminotransferase and aspartate aminotransferase levels >2× upper limit of normal (ULN). Apixaban is not recommended in patients with severe hepatic impairment and is contraindicated in those with hepatic disease associated with coagulopathy and clinically relevant bleeding risk. Dabigatran is not recommended in patients with elevated liver enzymes (>2× ULN). Dabigatran is contraindicated in patients with hepatic impairment or liver disease expected to have any impact on survival. Currently, edoxaban is not available in the US or European markets. However, the Japanese label did not restrict use in hepatic dysfunction but advises care in patients with severe hepatic impairment.
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Shakeri-Nejad K, Hoch M, Hoever P, Dingemanse J. Influence of mild and moderate liver impairment on the pharmacokinetics and metabolism of almorexant, a dual orexin receptor antagonist. Eur J Pharm Sci 2013; 49:836-44. [PMID: 23770377 DOI: 10.1016/j.ejps.2013.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 04/09/2013] [Accepted: 06/02/2013] [Indexed: 02/05/2023]
Abstract
This single-dose study aimed at investigating the effect of different degrees of hepatic impairment on the pharmacokinetics (PK), metabolism, and tolerability of almorexant, a first-in-class dual orexin receptor antagonist. Subjects with mild (Child-Pugh A, Group A, n=8) and moderate (Child-Pugh B, Group B, n=9) liver impairment and subjects with normal liver function (Group DA and DB, both n=9) received a dose of 100mg almorexant. PK parameters of almorexant and its four primary metabolites were determined. Almorexant exposure increased with severity of hepatic impairment. Geometric mean ratios (90% confidence interval) of AUC0-∞ were 2.8 (1.5-5.4), 7.2 (3.7-14.1), and 3.3 (1.7-6.4) comparing A vs. DA, B vs. DB, and B vs. A, respectively. The four metabolic pathways involved in the formation of the primary metabolites were affected in a different fashion. Geometric mean AUC0-∞ ratios comparing A vs. DA were 6.9, 1.1, 1.4, and 3.6 for M3, M5, M6, and M8, respectively. Comparing B vs. DB the corresponding figures were 7.3, 2.0, 5.4, and 1.3, respectively. Significant effects of hepatic impairment on the PK of almorexant suggested the need for dose adjustment in subjects with mild hepatic impairment and did not support its use in subjects with moderate or severe hepatic impairment.
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Affiliation(s)
- Kasra Shakeri-Nejad
- Actelion Pharmaceuticals Ltd, Department of Clinical Pharmacology, Gewerbestrasse 16, 4123 Allschwil, Switzerland
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Cardiohepatic Interactions in Heart Failure. J Am Coll Cardiol 2013; 61:2397-2405. [DOI: 10.1016/j.jacc.2013.03.042] [Citation(s) in RCA: 174] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 03/01/2013] [Accepted: 03/03/2013] [Indexed: 01/07/2023]
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Lewis JH, Stine JG. Review article: prescribing medications in patients with cirrhosis - a practical guide. Aliment Pharmacol Ther 2013; 37:1132-56. [PMID: 23638982 DOI: 10.1111/apt.12324] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 11/30/2012] [Accepted: 04/08/2013] [Indexed: 02/06/2023]
Abstract
BACKGROUND Most drugs have not been well studied in cirrhosis; recommendations on safe use are based largely on experience and/or expert opinion, with dosing recommendations often based on pharmacokinetic (PK) changes. AIM To provide a practical approach to prescribing medications for cirrhotic patients. METHODS An indexed MEDLINE search was conducted using keywords cirrhosis, drug-induced liver injury, pharmacodynamics (PDs), PKs, drug disposition and adverse drug reactions. Unpublished information from the Food and Drug Administration and industry was also reviewed. RESULTS Most medications have not been adequately studied in cirrhosis, and specific prescribing information is often lacking. Lower doses are generally recommended based on PK changes, but data are limited in terms of correlating PD effects with the degree of liver impairment. Very few drugs have been documented to have their hepatotoxicity potential enhanced by cirrhosis; most of these involve antituberculosis or antiretroviral agents used for HIV or viral hepatitis. Paracetamol can be used safely when prescribed in relatively small doses (2-3 g or less/day) for short durations, and is recommended as first-line treatment of pain. In contrast, NSAIDs should be used cautiously (or not at all) in advanced cirrhosis. Proton pump inhibitors have been linked to an increased risk of spontaneous bacterial peritonitis (SBP) in cirrhosis and should be used with care. CONCLUSIONS Most drugs can be used safely in cirrhosis, including those that are potentially hepatotoxic, but lower doses or reduced dosing frequency is often recommended, due to altered PKs. Drugs that can precipitate renal failure, gastrointestinal bleeding, SBP and encephalopathy should be identified and avoided.
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Affiliation(s)
- J H Lewis
- Division of Gastroenterology and Hepatology, Department of Medicine, Georgetown University Medical Center, Washington, DC 20007, USA.
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40
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Stangier J, Stähle H, Rathgen K, Roth W, Shakeri-Nejad K. Pharmacokinetics and Pharmacodynamics of Dabigatran Etexilate, an Oral Direct Thrombin Inhibitor, Are Not Affected by Moderate Hepatic Impairment. J Clin Pharmacol 2013; 48:1411-9. [DOI: 10.1177/0091270008324179] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Butler K, Teng R. Pharmacokinetics, Pharmacodynamics, and Safety of Ticagrelor in Volunteers With Mild Hepatic Impairment. J Clin Pharmacol 2013; 51:978-87. [DOI: 10.1177/0091270010379409] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Li Z, Gan LS, Marbury T, Lasseter KC, Natarajan A, Stecher S, Wei D, Yang L, Freedman D, Deykin A. Pharmacokinetics of Oral Tonapofylline and Its Acyl-Glucuronide Metabolite in Patients With Mild and Moderate Hepatic Impairment. J Clin Pharmacol 2013; 52:543-51. [DOI: 10.1177/0091270011400413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kim H, Long-Boyle J, Rydholm N, Orchard PJ, Tolar J, Smith AR, Jacobson P, Brundage R. Population Pharmacokinetics of Unbound Mycophenolic Acid in Pediatric and Young Adult Patients Undergoing Allogeneic Hematopoietic Cell Transplantation. J Clin Pharmacol 2013; 52:1665-75. [DOI: 10.1177/0091270011422814] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Bosilkovska M, Walder B, Besson M, Daali Y, Desmeules J. Analgesics in patients with hepatic impairment: pharmacology and clinical implications. Drugs 2012; 72:1645-69. [PMID: 22867045 DOI: 10.2165/11635500-000000000-00000] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The physiological changes that accompany hepatic impairment alter drug disposition. Porto-systemic shunting might decrease the first-pass metabolism of a drug and lead to increased oral bioavailability of highly extracted drugs. Distribution can also be altered as a result of impaired production of drug-binding proteins or changes in body composition. Furthermore, the activity and capacity of hepatic drug metabolizing enzymes might be affected to various degrees in patients with chronic liver disease. These changes would result in increased concentrations and reduced plasma clearance of drugs, which is often difficult to predict. The pharmacology of analgesics is also altered in liver disease. Pain management in hepatically impaired patients is challenging owing to a lack of evidence-based guidelines for the use of analgesics in this population. Complications such as bleeding due to antiplatelet activity, gastrointestinal irritation, and renal failure are more likely to occur with nonsteroidal anti-inflammatory drugs in patients with severe hepatic impairment. Thus, this analgesic class should be avoided in this population. The pharmacokinetic parameters of paracetamol (acetaminophen) are altered in patients with severe liver disease, but the short-term use of this drug at reduced doses (2 grams daily) appears to be safe in patients with non-alcoholic liver disease. The disposition of a large number of opioid drugs is affected in the presence of hepatic impairment. Certain opioids such as codeine or tramadol, for instance, rely on hepatic biotransformation to active metabolites. A possible reduction of their analgesic effect would be the expected pharmacodynamic consequence of hepatic impairment. Some opioids, such as pethidine (meperidine), have toxic metabolites. The slower elimination of these metabolites can result in an increased risk of toxicity in patients with liver disease, and these drugs should be avoided in this population. The drug clearance of a number of opioids, such as morphine, oxycodone, tramadol and alfentanil, might be decreased in moderate or severe hepatic impairment. For the highly excreted morphine, hydromorphone and oxycodone, an important increase in bioavailability occurs after oral administration in patients with hepatic impairment. Lower doses and/or longer administration intervals should be used when these opioids are administered to patients with liver disease to avoid the risk of accumulation and the potential increase of adverse effects. Finally, the pharmacokinetics of phenylpiperidine opioids such as fentanyl, sufentanil and remifentanil appear to be unaffected in hepatic disease. All opioid drugs can precipitate or aggravate hepatic encephalopathy in patients with severe liver disease, thus requiring cautious use and careful monitoring.
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Affiliation(s)
- Marija Bosilkovska
- Division of Clinical Pharmacology and Toxicology, Geneva University Hospitals, Geneva, Switzerland
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45
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Abstract
Vildagliptin is an orally active, potent and selective dipeptidyl peptidase-4 (DPP-4) inhibitor, shown to be effective and well tolerated in patients with type 2 diabetes mellitus (T2DM) as either monotherapy or in combination with other anti-diabetic agents. Vildagliptin possesses several desirable pharmacokinetic properties that contribute to its lower variability and low potential for drug interaction. Following oral administration, vildagliptin is rapidly and well absorbed with an absolute bioavailability of 85%. An approximately dose-proportional increase in exposure to vildagliptin over the dose range of 25-200 mg has been reported. Food does not have a clinically relevant impact on the pharmacokinetics of vildagliptin, and it can be taken without regard to food. Vildagliptin is minimally bound to plasma proteins (9.3%) and, on the basis of a volume of distribution of 71 L, it is considered to distribute extensively into extravascular spaces. Renal clearance of vildagliptin (13 L/h) accounts for 33% of the total body clearance after intravenous administration (41 L/h). The primary elimination pathway is hydrolysis by multiple tissues/organs. The DPP-4 enzyme contributes to the formation of the major hydrolysis metabolite, LAY151; therefore, vildagliptin is also a substrate of DPP-4. Vildagliptin has a low potential for drug interactions, as cytochrome P450 (CYP) enzymes are minimally (<1.6%) involved in the overall metabolism. Clinical pharmacokinetic studies have reported the lack of drug interaction with several drugs (metformin, pioglitazone, glyburide, simvastatin, amlodipine, valsartan, ramipril, digoxin and warfarin) that are likely to be frequently co-administered to patients with T2DM. In particular, vildagliptin does not affect the pharmacokinetics of pioglitazone, glyburide, warfarin and simvastatin; therefore, it is not expected to affect the pharmacokinetics of a drug that is a substrate for CYP2C8, CYP2C9 or CYP3A4. In the elderly, vildagliptin exposure increases by approximately 30%, which is considered to be mostly attributable to compromised renal function in the elderly population and is not considered to be clinically relevant. Vildagliptin has been demonstrated to be efficacious, safe and well tolerated in elderly patients with T2DM without dose adjustment. In subjects with varying degrees of renal impairment, vildagliptin exposure increases by approximately 2-fold; however, the increase in the exposure does not correlate with the severity of renal impairment. The lack of a clear correlation between the increased exposure and the severity of renal impairment is considered to be attributable to the fact that the kidneys contribute to both the excretion and the hydrolysis metabolism of vildagliptin. Hepatic impairment, gender, body mass index (BMI) and ethnicity do not have an influence on the pharmacokinetics of vildagliptin. These findings suggest that vildagliptin can be used in a diverse patient population without dose adjustment. Oral administration of vildagliptin to patients with T2DM completely inhibits DPP-4 activity at a variety of doses. The onset of DPP-4 inhibition is rapid, and the duration of DPP-4 inhibition is dose dependent. Vildagliptin is a potent inhibitor of the DPP-4 enzyme, with a concentration required to achieve 50% DPP-4 inhibition (IC(50)) of 4.5 nmol/L in patients with T2DM. Similar potency of DPP-4 inhibition by vildagliptin has been reported in different ethnic groups, indicating that ethnicity does not affect the pharmacodynamics of vildagliptin. Vildagliptin significantly increases the active glucagon-like peptide 1 (GLP-1) levels by approximately 2- to 3-fold and glucose-dependent insulinotropic polypeptide (GIP) levels by approximately 5-fold, and significantly suppresses the postprandial glucagon levels in response to a meal or following an oral glucose tolerance test (OGTT) in patients with T2DM. Vildagliptin significantly reduces both fasting and postprandial glucose levels over the dose range of 50-100 mg daily (administered either once daily or twice daily), and there are no substantial additional benefits of doses greater than 50 mg twice daily. The primary clinical dosing regimen is 50 mg twice daily as monotherapy or in combination with metformin. Vildagliptin increases the insulin levels following an OGTT and an intravenous glucose tolerance test (IVGTT), and the stimulation of insulin secretion is glucose dependent. Vildagliptin has been shown to improve beta-cell function on the basis of pharmacodynamic modelling taking the reduced glucose levels into account. The improvement of beta-cell function by vildagliptin has been confirmed after chronic treatment with vildagliptin for up to 2 years. Reduction of the endogenous glucose production appears to contribute to the glucose-lowering effects. Unlike the GLP-1 receptor agonists, vildagliptin does not affect gastric emptying, and this is consistent with the favourable gastrointestinal safety profile. Vildagliptin improves the sensitivity of the alpha cell to glucose in patients with T2DM by enhancing the alpha-cell responsiveness to both suppressive effects of hyperglycaemia and stimulatory effects of hypoglycaemia. Consistently, a lower incidence of hypoglycaemic events with vildagliptin is reported when it is used as either monotherapy or in combination with other anti-diabetic agents, such as metformin or insulin, as compared with a sulphonylurea. Numerous long-term clinical trials of up to 2 years have demonstrated that vildagliptin 50 mg once daily or twice daily is effective, safe and well tolerated in patients with T2DM as either monotherapy or in combination with a variety of other anti-diabetic agents.
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Affiliation(s)
- Yan-Ling He
- Translational Medicine-Translational Science, Novartis Institutes for Biomedical Research, Cambridge, MA 02139, USA.
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Abstract
Cirrhosis and chronic liver disease are common illnesses that cause high mortality and require treatment. Medication use in these patients may be challenging because of idiosyncratic or dose-dependent drug toxicity. Therefore, drug choice and drug dose adaptations play an important role. The objective of this clinical review is to discuss the literature about and challenges in drug use in patients with chronic liver disease. To make good decisions regarding drug choice and dose adjustments in these patients, well-defined clinical information about diagnoses and laboratory results (creatinine, international normalized ratio, bilirubin, and serologies) as well as in some instances, pathological findings like liver biopsies are needed. In a second step, these data should be organized in electronically supported clinical decision systems, which can then assist providers in making choices about medication selection and dosage. In summary, although substantial research has been done in the field of drug use in patients with liver dysfunction, a great deal also remains to be learned. Although many of these patients can now be identified, it is still very difficult to assess their individual level of hepatic function. The degree of risk associated with drug use and how best to use medications in these patients represents an important area for further study. In the future, pharmacogenomics and electronic linking of clinical data may well prove helpful for making decisions about optimal drug choices in this complex group of patients.
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Clarke JD, Cherrington NJ. Genetics or environment in drug transport: the case of organic anion transporting polypeptides and adverse drug reactions. Expert Opin Drug Metab Toxicol 2012; 8:349-60. [PMID: 22280100 DOI: 10.1517/17425255.2012.656087] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
INTRODUCTION Organic anion transporting polypeptide (OATP) uptake transporters are important for the disposition of many drugs and perturbed OATP activity can contribute to adverse drug reactions (ADRs). It is well documented that both genetic and environmental factors can alter OATP expression and activity. Genetic factors include single nucleotide polymorphisms (SNPs) that change OATP activity and epigenetic regulation that modify OATP expression levels. SNPs in OATPs contribute to ADRs. Environmental factors include the pharmacological context of drug-drug interactions and the physiological context of liver diseases. Liver diseases such as non-alcoholic fatty liver disease, cholestasis and hepatocellular carcinoma change the expression of multiple OATP isoforms. The role of liver diseases in the occurrence of ADRs is unknown. AREAS COVERED This article covers the roles OATPs play in ADRs when considered in the context of genetic or environmental factors. The reader will gain a greater appreciation for the current evidence regarding the salience and importance of each factor in OATP-mediated ADRs. EXPERT OPINION A SNP in a single OATP transporter can cause changes in drug pharmacokinetics and contribute to ADRs but, because of overlap in substrate specificities, there is potential for compensatory transport by other OATP isoforms. By contrast, the expression of multiple OATP isoforms is decreased in liver diseases, reducing compensatory transport and thereby increasing the probability of ADRs. To date, most research has focused on the genetic factors in OATP-mediated ADRs while the impact of environmental factors has largely been ignored.
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Affiliation(s)
- John D Clarke
- University of Arizona, Department of Pharmacology and Toxicology, 1703 E. Mabel Street, Tucson, AZ 85721, USA
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Abstract
Therapeutic Reviews aim to provide essential independent information for health professionals about drugs used in palliative and hospice care. Additional content is available on www.palliativedrugs.com. Country-specific books (Hospice and Palliative Care Formulary USA, and Palliative Care Formulary, British and Canadian editions) are also available and can be ordered from www.palliativedrugs.com. The series editors welcome feedback on the articles (hq@palliativedrugs.com).
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Affiliation(s)
- Paul Howard
- Duchess of Kent House, Reading, United Kingdom
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Spriet I, Willems L. No interaction between valproate and meropenem in a cirrhotic patient. Ann Pharmacother 2011; 45:1167-8. [PMID: 21811003 DOI: 10.1345/aph.1q165] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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