Treating - Viagra Works

Viagra® is one of the best-known drugs of all time: Google lists over 17 million Web pages that use the word "Viagra." For comparison, Google lists only 3.3 million pages containing the word "aspirin" and only 936,000 containing the word "Tylenol." Billions of spam e-mail messages advertise Viagra® every day. There is so much Viagra spam, in fact, that Pfizer (the maker of Viagra) has a page addressing the problem, called Avoid Fake Viagra, prominently listed on Viagra.com. Pfizer has spent untold millions of dollars advertising Viagra®, so you see advertisements for the drug constantly on TV. Pfizer claims on its Web site that nine Viagra® pills are dispensed every second -- nearly 300 million tablets per year. The name recognition of Viagra® is so good that nearly every adult in America has heard of the drug and can tell you what it does. What Viagra® does is simple: When it works as intended, Viagra® causes a man who is sexually stimulated to get an erection. How does Viagra® do that? And why does Viagra® work only if the man is sexually stimulated? For that matter, what causes an erection in the first place? In this article, we'll answer all of those questions and more. This is actually a fascinating story -- it involves the technology of the human body and the techniques that scientists use to control different parts of the body with drugs. And in the case of Viagra®, the story starts with the technology of the penis...

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