http://www.Pharmaexpressrx.com/index.asp Viagra a very commonly name heard by almost all of us is mainly named as Sildenafil citrate as its chemical name. it is used as a commonly used oral medication for the erectile dysfunction and pulmonary arterial hypertension. It was first developed by the pharmaceutical company Pfizer. en-us Copyright 2008 Pharmaexpressrx.com. All Rights Reserved. Tue, 03 Jun 2008 08:02:03 -0400 http://backend.userland.com/rss http://www.pharmaexpressrx/images/doctor111.jpg http://www.Pharmaexpressrx.com/Sildenafil-citrate-Facts.asp 88 31 http://www.Pharmaexpressrx.com/index.asp Sildenafil was first developed by a group of pharmaceutical chemists working with Pfizer Sandwich Kent research facility in England. It was first used as the medication for hypertension and angina pectoris. Several clinical tests have been conducted at several establishments. http://www.Pharmaexpressrx.com/Sildenafil-citrate-Facts.asp After this revelation Pfizer has decided to market the drug as remedy for penile dysfunction rather than for angina. It was patented in 1996 approved to be used in erection dysfunction and launched in the market of USA latter that year itself.