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Starting Monday, Viagra will be facing stiffer competition. Viagra is the brand name for Pfizer's sildanefil, the erectile dysfunction (ED) drug that hit the market in 1998 and made it big, as in over 1.5 billion in revenues in 2016. But Viagra's patent is scheduled to expire in April 2020, which undoubtedly will give rise to a number of generic versions. But, as CBS News reported previously, a deal negotiated four years ago will allow Teva Pharmaceuticals USA Inc. to begin selling a generic version in the United States on December 11, 2017. Pfizer will counter with their own generic little white pill at half the current $65-a-little-blue-pill price.

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