Grapefruit and Seville oranges may interact with vardenafil and cause side effects. Call your doctor for medical advice about side effects. Drinking alcohol can increase certain side effects of vardenafil. Also, in rare cases, vardenafil use may cause priapism, a very painful emergency condition that can cause impotence if left untreated. Use Levitra Vardenafil exactly as directed on the label, or as prescribed by your doctor. Stop using vardenafil and get emergency medical help if you have: heart attack symptoms–chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating; vision changes or sudden vision loss; or erection is painful or lasts longer than 4 hours prolonged erection can damage the penis. An erection will not occur just by taking a pill.COMMON BRAND NAME(S): Levitra. USES: Vardenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an test1.ru drug does not protect against sexually transmitted diseases (such . In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an erection. This drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis). Vardenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis.