The active ingredient in Vidalista 20 mg, Tadalafil, works by inhibiting the enzyme PDE5, which is responsible for the breakdown of cyclic guanosine monophosphate (cGMP) in the penis. The presence of cGMP is crucial for the relaxation of the smooth muscles in the blood vessels of the penis, which allows for better blood flow. By inhibiting PDE5, Tadalafil increases the levels of cGMP, improving blood circulation to the penis when sexually stimulated.

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