- Current treatment with a drug that inhibits CYP3A4, including: cimetidine; cyclosporine; erythromycin or erythromycin-like drugs (e.g., azithromycin, clarithromycin); diltiazem; fluoxetine, fluovoxamine; itraconazole, ketoconazole or other systemic antifungal agents in the azole class; nefazodone; or induce CYP3A4, including: carbamazepine, modafinil; phenobarbital; phenytoin; rifampin; St. Johns wort; and troglitazone.