Sildenafil, the active ingredient in Viagra, was originally developed to treat cardiovascular problems. It was meant to dilate the heart's blood. Sildenafil (Viagra) — the first oral drug for erectile dysfunction to hit the market in Infographic showing the history of sildenafil (Viagra). Take a look back at Viagra's history. British Pfizer scientists Peter Dunn and Albert Wood create a drug called sildenafil citrate that they.
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