Viagra
Nicholas Terrett
Nicholas Terrett

Bell, Brown and Terrett 1991

In 1991, inventors Andrew Bell, Dr David Brown and Dr Nicholas Terrett (also Pfizer employees at Kent England) discovered that chemical compounds belonging to the pyrazolopyrimidinone class were useful in treating heart problems such as angina. Nicholas Terrett was named in the 1991 British patent for Sildenafil (tradenamed Viagra) as a heart medicine.

Terrett 1994

Viagra pills
Viagra pills


Terrett was conducting a study on Sildenafil as a heart medicine when it was discovered that it caused increased blood to flow to the penis as a side effect. Actually, the pill didn't pan out as an effective treatment for angina but still showed promise in the area of hypertension. Instead, Pfizer decided to market the drug as an erectile enhancer. Wood and Dunn established the process to turn it into a pill and production was off.
March 27th 1998, the FDA approved Viagra as the first drug to treat impotence. Between 1999 and 2001 sales annual sales of Viagra were more than one billion dollars (~£670,000,000 pounds).

Peter Dunn and Albert Wood both of Kent, England are named as the inventors of the process by which Viagra was created. Their names appeared on an application by Pfizer to patent (WOWO9849166A1) the manufacturing process of Viagra or its Medical name, Sildenafil Citrate.
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TAGS:, Viagra, terrett, heart, process, sildenafil, pfizer, 1991