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- Sildenafil - Wikipedia
"Pfizer to lose patent of drug Viagra, Indian companies gear up with copycat versions: Pfizer's patent for the formulation of Viagra, used to treat impotence in men, ends in the US in 2020"
- Sildenafil (Viagra, Revatio) - Uses, Side Effects, and More
Find patient medical information for Sildenafil (Viagra, Revatio) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings
- Sildenafil (Viagra): medicine for erection problems - NHS
Find out how sildenafil treats erection problems and pulmonary hypertension and how to take it NHS medicines information on sildenafil – what it's used for, side effects, dosage and who can take it
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