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Five viagra (sildenafil citrate) pills

Five viagra (sildenafil citrate) pills

M625/0856

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Credit

SAM OGDEN / SCIENCE PHOTO LIBRARY SAM OGDEN / SCIENCE PHOTO LIBRARY

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Editorial use only.

Caption

Viagra impotence pills. Five 50 milligram Viagra pills used to treat male impotence. Viagra is the trade-name for the drug sildenafil citrate. It is the first oral pill for impotence. It works by enhancing the action of nitric oxide in the body, which is released in response to sexual stimulation. This relaxes smooth muscle in the penis, allowing blood to enter, which leads to an erection. The stated dose is one 50mg pill taken an hour before sexual activity, although 25mg and 100mg pills are also available. Viagra is made by Pfizer Pharmaceuticals.

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