Sildenafil Citrate, the active ingredient in Malegra 100 mg, is a PDE5 inhibitor. It works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which normally breaks down cGMP, a molecule that helps relax smooth muscles and widen blood vessels in the penis.By preventing the breakdown of cGMP, Sildenafil increases blood flow to the penis, enabling an erection when sexually stimulated.
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