Buy Levitra Online No Prescription Vardenafil, Levitra is a brand name for the medication vardenafil. It is a phosphodiesterase type 5 (PDE5) inhibitor, which is a class of drugs used to treat erectile dysfunction (ED). ED is the inability to achieve or maintain an erection sufficient for sexual intercourse.Levitra works by increasing blood flow to the penis during sexual stimulation. This increased blood flow can help to cause an erection. Levitra is taken by mouth about 60 minutes before sexual activity.