Sildenafil works by inhibiting the PDE5 enzyme, which is responsible for breaking down cGMP (cyclic guanosine monophosphate), a substance that relaxes blood vessels and increases blood flow to the penis. During sexual arousal, nitric oxide is released, leading to the production of cGMP. By preventing its breakdown, Zenegra enhances erectile function, making it easier for men to achieve a satisfactory erection.
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