Ensure the adhering to drugs you are taking are mentioned to make certain your physician could adjust the quantity of Cialis and make it efficient for you: erythromycin, metronidazole HIV protease inhibitors, higher blood tension medications, nevirapine, phenobarbital, fluvoxamine, antifungals, alpha blockers, cyclosporine, delavirdine, isoniazid, ritonavir, diltiazem, dexamethasone, cimetidine, clarithromycin, ethosuximide, lovastatin, erectile dysfunction medicines, rifabutin, verapamil, zafirlukast, sertraline, troleandomycin, phenytoin, rifampin, nefazodone, and fluoxetine.