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Buy Viagra Online! Viagra has revolutionized the way physicians treat men suffering from erectile dysfunction and impotence. For the first time, a potent oral medication is available that is able to markedly improve sexual activity in over 80% of men with erectile dysfunction. Viagra is the brand name for sildenafil. When sexual stimulation begins nitric oxide (NO) is released into the spongy tissue of the penis. NO then activates an enzyme that increases the production of cyclic guanosine monophosphate (cGMP) the substance that relaxes the spongy tissue of the penis and facilitates an influx of blood. As specific enzymes slowly degrade cGMP the penis will slowly loose its ability to sustain an erection. Viagra works by inhibiting those enzymes that degrade cGMP, thereby enhancing ones ability to obtain and sustain an erection.
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