Viagra drug structure formula

Viagra drug structure formula

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Viagra. Structural formula of the drug Viagra sildenafil superimposed a Viagra packaging. The drug is used to treat male impotence. Unlike treatments that directly cause penile erections, Viagra affects the response to sexual stimulation. Viagra enhances the smooth muscle relaxant effects of nitric oxide, which is released in response to sexual stimulation. Smooth muscle relaxation allows blood to enter the penis leading to an erection.

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