Alcohol, other CNS depression-producing medications, antihypertensive agents, cimetidine, CYP450 3A isoenzyme inhibitors eg, clarithromycin, diltiazem, erythromycin, fluconazole, itraconazole, ketoconazole, nefazodone, verapamil, dopamine agonists or levodopa, CYP450 hepatic enzyme inducers, lorazepam, thioridazine.