Minor
Suspected
Description
Gabapentin and valproic acid have a minor pharmacokinetic interaction; valproate may slightly increase gabapentin renal clearance.
Mechanism
Gabapentin is renally excreted unchanged; valproate may slightly alter renal tubular handling of gabapentin but the clinical effect is minor.
Clinical Significance
The interaction is generally not clinically significant; however, combined CNS depressant effects can cause additive sedation.
Management
Monitor for excessive sedation; dose adjustments are rarely required for the pharmacokinetic component of this interaction.