Viagra

What is Viagra?
Viagra is a drug from Pfizer Pharmaceuticals for use in the treatment of male impotency. It is the first oral treatment for male impotence filed with the US Food & Drug Administration and the European Medicines Evaluation Agency. It was approved by the FDA on March 27th 1998. Viagra is now approved to order worldwide and has gone on to become the most successful treatment for sexual dysfunction.

How does Viagra work?
Viagra is taken orally and is a known as a phosphodiesterase 5 (PDE5) inhibitor. By inhibiting the PDE5 enzyme, which is found mainly in the penis, Viagra allows the chemical produced during sexual stimulation, cyclic GMP, to persist. The longer cyclic GMP persists, the better chance for increased blood flow and thereby, an erection.

What is Viagra's success rate?
According to reports released in May, 1996 the success rate of Viagra was between 65% to 88% compared to 39% for those subjects receiving a placebo. According