In last few decades erectile dysfunction problem is increasing day by day. Many pharmaceutical companies started research for finding a permanent medication for this sexual disorder. After deep research Pfizer launch a drug named Viagra which is very effective in ED patients. Viagra is first ED drug approved by FDA on March 27, 1998. It is a blue pill which starts work within 30 minutes after its consumption and usually work 4 hours long.
After Viagra, Levitra was launch in the market. Levitra was manufactured by German based Bayer Pharmaceuticals Corp. Levitra is Second anti impotency drug which got approval on August 20, 2003 by FDA. The main ingredient of Levitra is Vardenafil which relaxes the muscles of penis and increases the blood flow into the penis. As a result a full erection can be maintained during sexual intercourse. Levitra remains effective up to five hours. So with Levitra you can enjoy sex one hour more then Viagra.
Levitra is mainly blocks the enzyme named phosphodiesterase-5 (PDE5), which is responsible for an erection. Levitra should not be taken without proper prescription.