Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. If you are taking tadalafil to treat PAH or BPH, follow your doctor’s directions and the guidelines in this paragraph. Finally, we checked customer reviews to better understand user experiences with each platform. Your doctor will probably tell you not to take tadalafil if you are taking nitrates. Follow your doctor’s directions carefully, and ask your doctor or pharmacist to explain any part you do not understand. · US Brand Name Adcirca Cialis Descriptions Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a . Cialis is a brand of tadalafil, one of the most popular medications to treat erectile dysfunction (ED).It was first approved in Cialis is popular because it offers dosing flexibility, works. Cialis (tadalafil) is a moderately priced drug used to treat erection problems in men. It may also be used to treat the enlargement of the prostate gland. This drug is slightly more popular than comparable drugs. It is available in both brand and generic versions.