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Sildenafil citrate, the active ingredient in Cenforce 25 mg, is a PDE5 inhibitor. It works by blocking the enzyme phosphodiesterase type 5 (PDE5), which is responsible for breaking down cGMP (cyclic guanosine monophosphate). cGMP is a substance that helps relax the smooth muscles of the blood vessels, allowing more blood to flow to the penis. By inhibiting PDE5, Cenforce 25 mg increases the levels of cGMP, improving blood flow and enabling an erection when sexually stimulated.