The following ones ought to be talked about as harmful interactions are possible: alpha blockers, HIV protease inhibitors, verapamil, lovastatin, cyclosporine, danazol, dexamethasone, antifungals, erythromycin, diltiazem, phenobarbital, efavirenz, medications for hypertension, clarithromycin, rifabutin, phenytoin, cimetidine, metronidazole, delavirdine, erectile dysfunction medicines, fluoxetine, sertraline, isoniazid, fluvoxamine, and rifampin.