Major considerations in the acceptance and impact of new antiepileptic drug
s include their pharmacokinetics and their potential for interaction with o
ther drugs. The pharmacokinetics of levetiracetam. a newly approved add-on
antiepileptic agent for partial-onset seizures in adults, has been evaluate
d in 27 phase I and II studies. Consistent findings in these studies includ
e rapid and complete oral absorption, linear dose kinetics, a minimal degre
e of protein binding, and predominantly renal excretion. Because of the lac
k of hepatic metabolism and low protein binding, the risk of interaction wi
th other drugs is considered low.