Cialis is not recommended for people taking any form of nitroglycerin because the combination may lower blood pressure to an unsafe level. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. A small number of patients taking Cialis also reported abnormal vision. Tadalafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow more easily. You can report an adverse event either online, by regular mail or by fax, using the contact information at the bottom of this page.Tadalafil Brand names: Cialis, Adcirca. Tadalafil. Find out how tadalafil treats erectile dysfunction, pulmonary hypertension and benign prostate enlargement, and how to take it. Tadalafil – STADA T20 – 20 Milligramm. Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. [4] [5] [7] It is taken by mouth. [7] Onset is typically within half an hour and the duration is up to 36 hours. Tadalafil (Cialis) is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). Tadalafil works by helping to relax the blood vessels in the penis, allowing blood to flow into the penis, and causing an erection.