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Population pharmacokinetics of oral baclofen at steady-state in alcoholic-dependent adult patients.
- Source :
-
Fundamental & clinical pharmacology [Fundam Clin Pharmacol] 2018 Apr; Vol. 32 (2), pp. 239-248. Date of Electronic Publication: 2017 Nov 23. - Publication Year :
- 2018
-
Abstract
- Baclofen has been proposed for few years to help treating alcohol dependence at higher doses than those used in neurology. Baclofen pharmacokinetics has been previously well described at low oral or intravenous doses but remains poorly investigated with such high oral doses. We here describe dose regimens of baclofen in 143 alcohol-dependent patients treated with steady-state oral doses of baclofen. Plasma baclofen levels were measured in blood samples using liquid chromatography coupled with tandem mass spectrometry. One hundred and forty-nine baclofen concentrations were sampled 30 min to 15 h after the last dose, and baclofen pharmacokinetics was determined using population pharmacokinetics approach. Our population, whose average age and BMI were 51.5 years and 25.5 kg/m <superscript>2</superscript> , respectively, was composed of two-thirds of men. Daily baclofen doses ranged from 15 to 250 mg and 26% were higher than 120 mg. A one-compartment model with first-order absorption and elimination allowed to determine mean values for clearance (CL/F), volume of distribution (V/F) and absorption rate constant at 8.0 L/h, 44.5 L and 2.23 h <superscript>-1</superscript> , respectively. Inter-individual variability on CL/F and V/F was 27.4 and 86% for the parameters. None of the demographic and biological covariates significantly decreased inter-individual variability. A proportional relationship between oral dose and plasma baclofen exposure indicated a linear pharmacokinetics of baclofen even at doses over 120 mg/day. Our large population study evidenced a linear pharmacokinetics of oral baclofen even at high daily doses with an inter-individual variability of baclofen exposure that could not be explained by demographic and biological data.<br /> (© 2017 Société Française de Pharmacologie et de Thérapeutique.)
- Subjects :
- Administration, Oral
Adult
Alcoholism blood
Alcoholism diagnosis
Biological Variation, Individual
Chromatography, Liquid
Female
France
Humans
Linear Models
Male
Middle Aged
Models, Biological
Reproducibility of Results
Spectrometry, Mass, Electrospray Ionization
Tandem Mass Spectrometry
Alcoholism drug therapy
Baclofen administration & dosage
Baclofen pharmacokinetics
GABA-B Receptor Agonists administration & dosage
GABA-B Receptor Agonists pharmacokinetics
Subjects
Details
- Language :
- English
- ISSN :
- 1472-8206
- Volume :
- 32
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Fundamental & clinical pharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 29091319
- Full Text :
- https://doi.org/10.1111/fcp.12330