How Viagra, Levitra, and Cialis Work

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How Viagra, Levitra, and cheap cialis Work

"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"[1].

1.http://health.howstuffworks.com/viagra.htm