title: Pharmacokinetics of phenylethylmalonamide (PEMA) after oral and intravenous administration.
abstract: The pharmacokinetics of phenylethylmalonamide (PEMA), one of the major metabolites of the antiepileptic drug primidone, have been studied in 6 healthy volunteers after administration of single 500mg intravenous and oral doses. Following intravenous administration, after a very short distributive phase (t1/2 = 0.23-0.53h), the decline of the log-PEMA concentration with respect to time appeared linear. The pharmacokinetic parameters, calculated according to a 1-compartment open model, showed the following values (mean +/- SD): terminal half-life, 15.7 +/- 3.4h; apparent volume of distribution, 0.69 +/- 0.10 L/kg; total serum clearance, 31.3 +/- 6.6 ml/h/kg. After oral administration, peak serum concentrations occurred at 0.5 to 4 hours and the oral bioavailability was 86.4 to 95.9%.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D004827:Epilepsy / Q000188:drug therapy; D005260:Female; D006801:Humans; D007275:Injections, Intravenous; D007700:Kinetics; D008297:Male; D008314:Malonates / Q000378:metabolism*; D010657:Phenylethylmalonamide / Q000378:metabolism* / Q000627:therapeutic use
chemical_list: D008314:Malonates; D010657:Phenylethylmalonamide