May decrease contraceptive efficacy w/ drugs for infection (ampicillin, chloramphenicol, neomycin, penicillin V, nitrofurantoin, sulfonamides, tetracycline & INH), pain (analgesics, antimigraine & tranquilizer) & hepatic enzyme inducers (carbamazepine, oxcarbazepine, felbamate, topiramate, phenytoin), antifungal (griseofulvin), antidiabetic (troglitazone), musculoskeletal (phenylbutazone), anti-TB (rifampicin). May inhibit cytochrome P450 isoenzyme 3A4 w/ anti-infective drugs (clarithromycin, erythromycin, itraconazole, ketoconazole, ritonavir) or grapefruit juice. May increase risk of cholestatic jaundice w/ troleandomycin.