Drinking alcohol can increase certain side effects of vardenafil. Tell your doctor immediately. Side Effects What are the side effects of Levitra Vardenafil? The medicine can help achieve an erection when sexual stimulation occurs. Use Levitra Vardenafil exactly as directed on the label, or as prescribed by your doctor.You should consult your health care professional before taking any drug, changing your diet, or commencing or discontinuing any course of treatment. Vardenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, vardenafil w. 25 mg, 50 mg, mg: mg, 5 mg, 10 mg, 20 mg: 5 mg, 10 mg, 20 mg: 50 mg, mg, mg: Usual dose you take: 50 mg: 10 mg (when used as needed); mg . The maximum dose is 20 mg. Vardenafil shouldn’t be taken more than once a day at any dose. Your dose might differ if you have liver problems, are 65 years of age or older, .