The active ingredient in Tadagra Softgel 20 mg, Tadalafil, works by inhibiting the enzyme phosphodiesterase type 5 (PDE5). PDE5 is responsible for breaking down cyclic guanosine monophosphate (cGMP), a substance that plays a key role in the relaxation of smooth muscle and the dilation of blood vessels in the penis. By blocking the action of PDE5, Tadalafil increases the levels of cGMP, leading to the relaxation of smooth muscles and increased blood flow to the penis during sexual arousal.

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