Tadalafil in Tadasoft 20 mg is a PDE5 inhibitor, similar to the active ingredients in other ED medications. When you take a tablet of Tadasoft 20  , the Tadalafil works by inhibiting the PDE5 enzyme, which leads to increased levels of cyclic guanosine monophosphate (cGMP). This chemical messenger helps to relax the smooth muscles in the penile region and dilate the blood vessels, promoting improved blood flow to the penis. As a result, men can achieve and maintain erections during sexual stimulation.