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It's vital that you initially talk to your doctor if you are going to take any of the adhering to drugs while making use of Cialis for impotence: efavirenz, rifampin, troleandomycin, medications for high blood tension, zafirlukast, clarithromycin, alpha blockers, cyclosporine, cimetidine, fluoxetine, antifungals, phenobarbital, aprepitant, treatments for erectile dysfunction, sertraline, HIV protease inhibitors, ethosuximide, or phenytoin.