Viagra is one of the best-known drugs of all time:
* 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.
* 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. If you are interesting How Viagra Works? i recomment you visit good website about Viagra - Viagra FAQ.
