Divalproex (valproate) and Etravirine interaction
Divalproex (valproate) and Etravirine: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Divalproex (valproate) (Depakote ER) label · effective 2026-03-31
Hepatic enzyme-inducing drugs (e.g., phenytoin, carbamazepine, phenobarbital, primidone, rifampin) can increase valproate clearance, while enzyme inhibitors (e.g., felbamate) can decrease valproate clearance.
Therefore, increased monitoring of valproate and concomitant drug concentrations and dosage adjustment are indicated whenever enzyme-inducing or inhibiting drugs are introduced or withdrawn ( 7.1 )
Because of these changes in valproate clearance, monitoring of valproate and concomitant drug concentrations should be increased whenever enzyme inducing drugs are introduced or withdrawn.
Additionally, the relevance of these in vitro findings is uncertain for patients receiving maximally suppressive antiretroviral therapy.
From the Etravirine label · effective 2025-04-02
Anticonvulsants : carbamazepine phenobarbital phenytoin ↓ etravirine Carbamazepine, phenobarbital and phenytoin are inducers of CYP450 enzymes.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.