Viagra is one of Pfizer's top drugs, with $2 billion in worldwide revenue last year. And it's the most counterfeited drug in the U.S., according to the company.A 2011 study, in which Pfizer bought "Viagra" from 22 popular Internet pharmacies and tested the pills, found 77 percent were counterfeit. Most had half or less of the promised level of the active ingredient.
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