Unlike previously Approved treatments for impotence, Viagra does not directly cause penile erection, but affects the Response to sexual stimulation. The drug acts by enhancing the smooth muscle relaxant effects of nitric Oxide, a substance that is normally released locally in response to sexual stimulation. The product was approved by FDA in less than six months after submission. All trademarks and registered trademarks are of their respective companies. Co. Claritin is a registered trademark of Schering Corporation.
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