Zudena Pills:

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Udenafil, the active ingredient in Zudena, works by inhibiting the enzyme phosphodiesterase type 5 (PDE5). This enzyme normally breaks down cyclic GMP, a substance that helps relax the blood vessels in the penis. By inhibiting PDE5, Udenafil helps to maintain higher levels of cyclic GMP, promoting increased blood flow to the penis, which facilitates an erection.