Viagra was approved by the Pfizer first on 1989 . August 19 , 2003 : The FDA approves Bayer Corporation 's vardenafil hydrochloride , sold under the brand name Levitra , to treat erectile dysfunction in men . American scientists working for Pfizer first created the drug in March 27 , 1998 . Since then 2000 major competitors for Viagra have been approved .
Viagra was approved by the Pfizer first on 1989 . American scientists working for Pfizer first created the drug in March 27 , 1998 . Since then 2000 major competitors for Viagra have been approved .