Effect of repeated administration of eslicarbazepine acetate on the pharmacokinetics of simvastatin in healthy subjects

Epilepsy Res. 2013 Sep;106(1-2):244-9. doi: 10.1016/j.eplepsyres.2013.04.009. Epub 2013 May 30.

Abstract

Objective: To investigate the effect of eslicarbazepine acetate (ESL) on the pharmacokinetics of simvastatin (SMV), a known CYP3A4 substrate, in healthy subjects.

Methods: Single centre, two-way cross-over, randomized, open-label study in 24 healthy volunteers. The volunteers received an oral single-dose of SMV 80mg on two occasions (once administered alone and once after treatment with an oral once-daily dose of 800mg of ESL for 14 days), separated by a wash-out period of 3 weeks or more. The analysis of variance (ANOVA) was used to test for differences between Test (SMV under co-administration with ESL) and Reference (SMV administered alone) treatments for AUC0-∞, AUC0-t and Cmax of SMV and SMV-acid.

Results: Mean systemic exposure (AUC) measurements for both SMV and SMV-β-hydroxyacid (SMV-acid) were up to 54% lower during ESL use. The Test/Reference geometric mean ratios (GMR) (90% CI) for the AUC0-t of SMV and SMV-acid were 46% (38%; 55%) and 49% (44%; 55%), respectively. Mean peak concentrations (Cmax) of both SMV and SMV-acid were reduced by 60% and 41%, respectively, when SMV was administered with ESL.

Conclusions: A significant effect of repeated ESL administration on the pharmacokinetics of SMV and its metabolite SMV-acid was observed. Therefore, dose adjustment of SMV may be required when used concomitantly with ESL, if a clinically significant change in lipids is noted.

Keywords: Antiepileptic drugs; Eslicarbazepine acetate; Healthy subjects; Pharmacokinetics; Simvastatin.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Analysis of Variance
  • Area Under Curve
  • Biotransformation
  • Chromatography, High Pressure Liquid
  • Cross-Over Studies
  • Cytochrome P-450 CYP3A / metabolism
  • Dibenzazepines / adverse effects
  • Dibenzazepines / pharmacology*
  • Drug Interactions
  • Electrocardiography / drug effects
  • Female
  • Half-Life
  • Healthy Volunteers
  • Humans
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors / blood
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors / pharmacokinetics*
  • Male
  • Middle Aged
  • Simvastatin / blood
  • Simvastatin / pharmacokinetics*
  • Voltage-Gated Sodium Channel Blockers / adverse effects*
  • Voltage-Gated Sodium Channel Blockers / pharmacology*
  • Young Adult

Substances

  • Dibenzazepines
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors
  • Voltage-Gated Sodium Channel Blockers
  • Simvastatin
  • eslicarbazepine acetate
  • Cytochrome P-450 CYP3A
  • CYP3A4 protein, human