DESC: Levitra, Vardenafil, Erectile Dysfunction, is the persistent inability to achieve and maintain an erection sufficient to complete sexual intercourse. Vardenafil does not directly cause an erection of the penis, but it alters the body’s response to sexual stimulation by enhancing the effect of the nitric oxide, a chemical that is normally released during stimulation. Nitric oxide causes relaxation of the muscles in the penis, which allows for better blood flow to the penile area. This medication does not cure impotency, increase a man’s sexual desire, protect from sexually transmitted diseases, or serve as birth control.