Lack of a clinically significant effect of zonisamide on phenytoin steady-state pharmacokinetics in patients with epilepsy.

Abstract:

:This study was designed to measure the effect of the addition of zonisamide on phenytoin pharmacokinetics under steady-state conditions in patients with epilepsy. Nineteen patients stabilized under phenytoin monotherapy were included in a 3-center, open-label, 1-way drug interaction trial. Zonisamide was gradually increased to 400 mg/day, taken twice daily. Three pharmacokinetic profiles were performed: on days -7 and -1, to assess pharmacokinetic parameters of oral phenytoin administered alone, and on day 35, after 14 days of zonisamide treatment, to evaluate the effect of zonisamide on phenytoin pharmacokinetics and to characterize zonisamide pharmacokinetics in the presence of phenytoin. Fourteen patients completed the study; the coadministration of zonisamide and phenytoin was safe and well tolerated. Zonisamide did not significantly affect the mean C(min), C(max), AUC(0-12), and CL/F of phenytoin measured before and after zonisamide administration. The pharmacokinetic measures of zonisamide in the presence of phenytoin were consistent with previous reports of induction of zonisamide metabolism by phenytoin.

journal_name

J Clin Pharmacol

authors

Levy RH,Ragueneau-Majlessi I,Garnett WR,Schmerler M,Rosenfeld W,Shah J,Pan WJ

doi

10.1177/0091270004268045

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

1230-4

issue

11

eissn

0091-2700

issn

1552-4604

pii

44/11/1230

journal_volume

44

pub_type

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