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Tadalafil, the active ingredient in Tadasoft, works by inhibiting the enzyme PDE5, which typically breaks down cGMP (cyclic guanosine monophosphate). cGMP helps relax the smooth muscles in the blood vessels of the penis, leading to increased blood flow. By inhibiting PDE5, Tadasoft 40 mg helps maintain higher levels of cGMP, promoting better blood flow to the penis during sexual activity.