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* 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.
* Quetiapine is principally metabolized by CYP3A4 to active and inactive metabolites.
* 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.<ref> {{Pubmed|18579216|Vieta E at al, Efficacy and safety of quetiapine in combination with lithium or divalproex for maintenance of patients with bipolar I disorder (international trial 126). J Affect Disord. 2008 Aug;109(3):251-63. Epub 2008 Jun 24}}</ref>
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* Start quetiapine according to the general dosing advice.
