Abstract
We studied the pharmacokinetics of valproic acid (VPA) in 11 children before and after discontinuance of enzyme-inducing antiepileptic drugs (AEDs). Valproic acid elimination half-life increased from 7.1 to 11.8 hours. Total and intrinsic VPA clearance decreased by approximately 40%. Valproic acid serum protein binding varied among patients from 7 to 23.8%, but was not altered by AEDs. Seizure control was maintained and mental status improved once all other AEDs were withdrawn. After discontinuation of enzyme-inducing AEDs, serum VPA concentrations can be maintained with a lower VPA dosage given less frequently.
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