In some cases, ED can cause a strain on relationships and impact self-esteem. It may be difficult to remain firm despite wanting to have sex. Vardenafil is taken only when needed, about 60 minutes before sexual activity. It is important to take Levitra Vardenafil exactly as prescribed by your doctor. A prolonged erection priapism can damage the penis. Swallow several times as the tablet dissolves.Oral medicines for ED usually work well and cause few side effects. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. Drugs & Supplements Levitra (Vardenafil) Generic Name: Vardenafil Reviewed: March 21, Vardenafil is used in adult men to treat erectile dysfunction (impotence). Vardenafil may also be used.  · Print Save Levitra Generic name: vardenafil [ var-DEN-a-fil ] Drug class: Impotence agents Medically reviewed by Philip Thornton, DipPharm. Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ The Levitra brand name has been discontinued in the U.S.