Generic Viagra is used to treat impotence in men. Viagra increases the body's ability to achieve and maintain an erection during sexual stimulation. Viagra does not protect you from getting sexually transmitted diseases, including HIV.Viagra is an anti-impotence drug manufactured by Pfizer with an active ingredient sildenafile citrate for treatment of male impotence. Sildenafile citrate relaxes the muscles and increases the blood flow to particular areas of the body. The intake of Viagra increases the ability to achieve and sustain erection on being sexually stimulated. Men taking Viagra have reported an amplified sex drive, increased stamina, and quicker recharge. Viagra works together with sexual stimulation to help achieve maximum sexual satisfaction. However, Viagra does not guarantee protection from getting sexually transmitted diseases, including HIV and Hepatitis. This Generic version of the world's first ED pill should be taken at least 30-60 minutes before sexual intercourse. It lasts 4 hours and can be taken up to three times a day. The success rate of oral ED drugs is very high, above 90%; however different people require different dosages to attain optimum results. Another reason to consider looking into both generic viagra is that if you are one of the rare people who does not respond to viagra, you may be able get satisfactory results from cialis. Another drug in the same class is sold by the brand name Levitra.