March 1998: The FDA approves the usage of the drug Viagra to deal with erectile dysfunction. 1989: British Pfizer scientists Peter Dunn and Albert Wooden create a drug known as sildenafil citrate that they consider will be helpful in treating high blood pressure and angina, a chest ache related to coronary heart disease. "Our information appear to counsel that there’s a relatively excessive number of deaths and adverse cardiovascular occasions related to using Viagra. The Washington Put up stories that the CIA is utilizing Viagra to gain pals in Afghanistan. June 1998: Newsweek calls Viagra the "hottest new drug in history nearly everywhere on the earth." At the time Viagra is just legal in the United States, Brazil, Morocco and Mexico, but Newsweek reports growing black market sales in other nations. April 2012: The FDA approves a new erectile dysfunction drug referred to as avanafil, which can be bought beneath the brand title Stendra. August 19, 2003: The FDA approves Bayer Corporation’s vardenafil hydrochloride, sold below the model title Levitra, to treat erectile dysfunction in males.