Viagra. 25 mg blue Viagra pills in bubble packaging. The box containing the pills can also be seen. Viagra is the trade-name for the drug sildenafil citrate, which is used to treat erectile dysfunction, a form of male impotence. It is the first oral pill for impotence. It does not cause penile erections directly, but instead affects the response to sexual stimulation. It enhances the smooth muscle relaxant effects of nitric oxide, a substance normally released in response to sexual stimulation. Smooth muscle relaxation allows blood to enter the penis, leading to an erection. Viagra is made by Pfizer Pharmaceuticals.

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