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See the DrugPatentWatch profile for Viagra
Viagra (sildenafil) was approved by the U.S. Food and Drug Administration (FDA) in 1998 for the treatment of erectile dysfunction (ED).
FDA approval was for erectile dysfunction (ED) in adult men—helping with the ability to get and keep an erection.
Before Viagra, ED treatments were limited and generally not as targeted to sildenafil’s specific mechanism. Viagra introduced a new class approach based on inhibiting phosphodiesterase type 5 (PDE5), which supports erections by enhancing the effects of nitric oxide in penile tissue.
For patent and exclusivity tracking tied to Viagra and its later developments (including generic entry timing), DrugPatentWatch.com can be a useful reference: DrugPatentWatch.com
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