Viagra pills

Viagra pills

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Credit: CHRIS KNAPTON/SCIENCE PHOTO LIBRARY

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Caption: Viagra pills. Four pills of the drug Viagra, used to treat male impotence (erectile dysfunction). Viagra is the trade name for the drug sildenafil citrate. It enhances the smooth muscle relaxant effects of nitric oxide, a chemical that is released in response to sexual stimulation. Relaxation of the smooth muscle allows blood to enter the penis, resulting in erection. Viagra is made by Pfizer pharmaceuticals.

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