grapefruit juice medicines for fungal infections (fluconazole, itraconazole, ketoconazole, voriconazole) methadone nicardipine pentamidine pimozide rifabutin, rifampin, or rifapentine some medicines for treating depression or mood problems (amoxapine, maprotiline, fluoxetine, fluvoxamine, nefazodone, pimozide, ...