Tazzle decreases blood flow to the penis by preventing certain enzymes from doing their job. Consequently, it relaxes the blood arteries supplying the penis and improves blood flow and oxygen delivery. Tazzle relaxes the blood vessels that supply the lungs, enabling blood to flow more freely and with less pressure from them, so reducing the symptoms of pulmonary arterial hypertension.

The prescription medication Tazzle contains the PDE5 inhibitor tadalafil, which helps men with erectile dysfunction achieve and maintain an erection. Benign prostatic hyperplaia reduces urinary symptoms caused by an enlarged prostate.It works by increasing blood flow to the penis and relaxing the smooth muscles of the prostate and bladder.