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| base = valproic acid
| add = risperidone
| info = * Valproic acid is principally metabolized by CYP2C9, CYP2C19, CYP2A6 and UDP-glucuronosyltransferases. Valproic acid is an inhibitor of the enzymes CYP2C9, epoxide-hydroxylase and UDP-glucuronosyltransferases. * Risperidone is principally metabolized by CYP2D6 to an active metabolite. * This combination of drugs may have possible synergistic effects. However, this combination will also have additive side effects. Dose adaptation will be recommended for this combination.
| start =
* Coadministration with risperidone may alter the serum concentrations of valproic acid, although data are conflicting.