Drug Interaction Report

Consumer information for this interaction is not currently available.

GENERALLY AVOID: Concomitant use of strong CYP450 3A4 inducers with tretinoin (systemic) may decrease the plasma concentration of tretinoin, which is a CYP450 3A4 substrate. Reduced efficacy of tretinoin may occur. Studies document the interaction between endogenous retinoids and CYP450 3A4 inducers (e.g., carbamazepine, phenytoin, phenobarbital) showing decreased concentration of the retinoids and reduced efficacy. While clinical data specific to tretinoin are not available, similar effects may occur.

MANAGEMENT: The manufacturer recommends avoiding concomitant use of tretinoin with strong CYP450 3A4 inducers due to a potentially significant reduction in its efficacy.

Ask your doctor before using primidone together with ethanol (alcohol), this can add to dizziness, drowsiness and other side effects of primidone. Be careful if you drive or do activities that require you to be awake and alert. Talk with your doctor before using any medications together, or drinking alcohol with primidone. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.