What is Viagra?

What is Viagra?

Viagra is a drug used to treat erectile dysfunction (impotence) in men. It relaxes the muscles in the walls of blood vessels and increases blood flow to the penis. Viagra is a potent selective (selective) inhibitor of cycloguanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). The pharmacological effect of this therapeutic action works by releasing nitric…