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Sildenafil citrate, better known by its brand name Viagra, became available to the public in 1998. Developed in 1989 in Sandwich, Kent, in the United Kingdom, for Pfizer Pharmaceuticals, Incorporated by Dr. Andrew Bell, Dr. David Brown, and Dr. Nicholas Terrett, sildenafil citrate was originally intended as a treatment for hypertension, or high blood pressure, and angina pectoris, a form of ischemic cardiovascular disease. After medical trials indicated that sildenafil citrate did not show promise as a heart medication, research was halted in 1992. Dr. Terrett, considered by some as the father of Viagra, was named in the original 1991 British drug patent.

Soon, researchers discovered that sildenafil citrate, despite its lack of promise in the world of cardiac medicine, showed an unusual capacity to increase ...

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