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Drug Interactions
| Question | Answer |
|---|---|
| CYP 3A4 Inducers | Decrease drug levels: Phenytoin, Phenobarbital, Oxcarbazepine, Carbamazepine, Rifampin, Smoking, SJW |
| CYP 3A4 Inhibitors | Increase drug levels: Grapefruit, protease inhibitors, azole antifungals, cyclosporine, cobicistat, macrolides (clarithromycin, erythromycin), amiodarone, Non-DHP CCBs |
| Warfarin interactions that can increase INR | CYP2C9 inhibitors: Amiodarone, azole antifungals, capecitabine, cimetidine, fluvastatin, fluvoxamine, metronidazole, tamoxifen, tigecycline, TMP/SMX, zafirlukast |
| Warfarin interactions that can decrease INR | aprepitant, bosentan, carbamazepine, phenobarbital, phenytoin, primidone, rifampin, licorice, SJW |