If you experience a prolonged erection for more than 4 hours or a painful erection for more than 6 hours, contact your doctor immediately. There is a problem with information submitted for this request. The results showed the combination to be even more effective than either medication alone. Your doctor will probably tell you not to take tadalafil if you are taking street drugs containing nitrates. This medicine comes with a patient information leaflet. Tadalafil may cause side effects. It is important to tell your doctor about any heart problems you have now or may have had in the past.AdBrowse thousands of brands and find deals on male ed meds at Amazon®. Shop Now! Discover new arrivals & latest discounts in male ed meds from your favorite has been visited by 1M+ users in the past month. Generic Cialis is called tadalafil, which is the active ingredient in Cialis. Cialis is Food and Drug Administration (FDA) approved to treat erectile dysfunction (ED) and benign prostatic. · Cialis; Descriptions. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .