5 Things You Might Not Know About Viagra

Ten years ago today, Viagra got the Food and Drug Administration's stamp of approval. Here are some facts about the little blue pill:

• Roughly 1 billion Viagra tablets have been doled out since the drug debuted.

• An average of about three Viagra tablets were dispensed each second between its launch and the end of last year.

• Thirty-five million men worldwide have used Viagra, which remains the most commonly prescribed drug for erectile dysfunction.

• The drug has been evaluated in more than 120 clinical trials involving more than 16,000 men.

• Viagra was also tested in about 3,000 women as a potential treatment for sexual arousal disorders. But the trials were "inconclusive," and Pfizer announced in 2004 that it had stopped them.

Statistics provided by Pfizer

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