A new generic for Revatio (sildenafil) will bring up questions about whether it can also be substituted for Viagra

A new generic for Revatio (sildenafil) will bring up questions about whether it can also be substituted for Viagra.

The patent on sildenafil expires this year...allowing companies to market generics for Revatio for pulmonary hypertension.

But the patent on Viagra will last until 2020...due to an additional patent on the use of sildenafil for erectile dysfunction.

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