| metabolization = * 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.<ref name="ftk">{{FTK|valproinezuur}}</ref>| <includeonly>| isswitch = 1</includeonly>