VA Drug Class Review: Phosphodiesterase Type 5 Inhibitors ...

Table 1. Phosphodiesterase Type 5 Inhibitors available in the U.S. Generic name Brand (Manufacturer) Strength & Formulations/package size FDA approval date, approval category, & earliest patent expiration Sildenafil Viagra (Pfizer) 25, 50, 100 mg unscored tablets March 27, 1998 1P, March, 27, 2012 ................
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