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It turns out that the human body has at least 11 different kinds of PDE that it produces. Only one of those kinds of PDE -- PDE5 -- is found primarily in the penis. Once scientists discovered this fact, the creation of Viagra® was relatively simple. All that Pfizer needed to find was a chemical that would selectively block PDE5 and nothing else. With the PDE5 blocked, cGMP could build up in the penis and increase the blood flow there without affecting other parts of the body.
If there were not a unique type of PDE found in the penis, we would not have Viagra today.
Generic Viagra makes it affordable to prolong and enjoy sexual pleasure for men.