This undated photo provided by pfizer shows a real Viagra pill on top of counterfeit pills. In a first for the drug industry, Pfizer Inc. told The Associated Press on May 6, 2013, that it will sell erectile dysfunction pill Viagra directly to patients on its website. (AP Photo/pfizer, William Vazquez)

Associated Press
This undated photo provided by pfizer shows a real Viagra pill on top of counterfeit pills. In a first for the drug industry, Pfizer Inc. told The Associated Press on May 6, 2013, that it will sell erectile dysfunction pill Viagra directly to patients on its website. (AP Photo/pfizer, William Vazquez)
This undated photo provided by pfizer shows a real Viagra pill on top of counterfeit pills. In a first for the drug industry, Pfizer Inc. told The Associated Press on May 6, 2013, that it will sell erectile dysfunction pill Viagra directly to patients on its website. (AP Photo/pfizer, William Vazquez)
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