Cyclic guanosine monophosphate
Medical term · C
A chemical in the body that widens blood vessels in the penis. This increases blood flow to the penis, causing an erection.
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Blood vesselsHollow tubes that transport blood throughout the body; includes arteries, veins, and capillaries.
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Sildenafil citrateThe active ingredient in Viagra. It blocks the breakdown of cyclic guanosine monophosphate, a chemical necessary for an erection.