Tazzle 20 belongs to a bunch of medicines called phosphodiesterase type 5 inhibitors. It increases blood flow within the penis by relaxing and widening the blood vessels and helps achieve and maintain erection sufficient for gender. By improving the blood flow to the prostate and relaxing the muscles within the prostate and also the bladder, tadalafil helps to alleviate urinary symptoms. Similarly, relaxation of blood vessels in lung results in lowering of force per unit area.