The active substance in Viagra – Sildenafil has been discovered in medicine in 1992 as a potential cure for ischemic heart disease. Sildenafil has been used to widen the blood vessels. Volunteers that have been taking drug have noticed really long and strong erections. The medicine was patented in 1998 by Pfizer under the name Viagra. Viagra name comes from the word “vigor” and “Niagara”.
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