Population pharmacokinetic/pharmacodynamic modelling of eltrombopag in healthy volunteers and subjects with chronic liver disease.

Abstract

AIMS:

To characterize the pharmacokinetics (PK)/pharmacodynamics (PD) of eltrombopag in chronic liver disease (CLD).

METHODS:

The PK/PD model was developed using data from 79 CLD patients using nonlinear mixed-effects modelling.

RESULTS:

The PK of eltrombopag were described by a two-compartment model with dual sequential first-order absorption. Gender, race and severity of CLD were predictors of the apparent clearance of eltrombopag. The PD of eltrombopag in CLD were adequately described by a four-compartment lifespan model, in which eltrombopag stimulated platelet precursor production rate. East Asian CLD patients were less sensitive to the stimulatory effect of eltrombopag. Following a daily dose regimen of 50 mg eltrombopag, the time to achieve peak platelet counts was longer for the CLD population compared with patients who had immune thrombocytopenic purpura, but was comparable to patients with hepatitis C. Likewise, it took a longer time for platelet counts to rebound back to baseline once eltrombopag treatment was discontinued.

CONCLUSIONS:

The time course of the platelet response in CLD was different from that in immune thrombocytopenic purpura but comparable to that in hepatitis C.

• Authors: Colm Farrell, Siobhan C Hayes, Mary Wire, Jianping Zhang
• Journal: British journal of clinical pharmacology (Br J Clin Pharmacol) Vol. 77 Issue 3 Pg. 532-44 (Mar 2014) ISSN: 1365-2125 [Electronic] England
• PMID: 24117976 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2013 The British Pharmacological Society.

Chemical References

• Benzoates
• Hydrazines
• Pyrazoles
• eltrombopag

Topics

• Adult
• Aged
• Aged, 80 and over
• Asian People
• Benzoates (administration & dosage, blood, pharmacokinetics)
• Blood Platelets (drug effects)
• Chronic Disease
• Clinical Trials, Phase I as Topic
• Clinical Trials, Phase II as Topic
• Computer Simulation
• Female
• Healthy Volunteers
• Humans
• Hydrazines (administration & dosage, blood, pharmacokinetics)
• Liver Diseases (blood, diagnosis, drug therapy, ethnology)
• Male
• Middle Aged
• Models, Biological
• Nonlinear Dynamics
• Platelet Count
• Pyrazoles (administration & dosage, blood, pharmacokinetics)
• Randomized Controlled Trials as Topic
• Thrombocytopenia (blood, diagnosis, drug therapy, ethnology)
• Treatment Outcome
• Young Adult