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How viagra works

If you want to create a drug that increases blood flow to the penis, there are at least three ways to do it:

1. Increase the amount of nitric oxide produced in the penis
2. Increase the amount of cGMP produced in the penis in response to the nitric oxide
3. Eliminate the PDE in the penis so that the cGMP builds up instead of getting decomposed by the PDE

Viagra® uses method number three — it eliminates the PDE that is decomposing the cGMP, so cGMP...more

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Viagra

Generic Name: sildenafil (oral) (sil DEN uh fil)
Brand Names: Revatio, Viagra

What is Viagra?

Viagra relaxes muscles and increases blood flow to particular areas of the body.
Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary ar...more