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Viagra, an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5).

Viagra relaxes muscles within the penis. In combination with sexual stimulation, Viagra works by helping the blood flow into the penis to achieve and maintain an erection. The time necessary for Viagra to exercise its action is about half an hour.