Sildenafil Citrate (brand name: Viagra) belongs to a group of medicines that delay the enzymes called phosphodiesterases from working too quickly. The penis is one of the areas where these enzymes work. Sildenafil C. is used to treat men who have erectile dysfunction (also called sexual impotence).
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By controlling the enzyme phosphodiesterase, Sildenafil Citrate helps to maintain an erection that is produced when the penis is stroked. Without physical action to the penis, such as that occurring during sexual intercourse, Sildenafil C. will not work to cause an erection.