Do not take vardenafil if you are also using a nitrate drug for chest pain or heart problems (such as nitroglycerin). Taking vardenafil with a nitrate medicine can cause a sudden and serious decrease in blood pressure.
During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away. You could be having a serious side effect of vardenafil.
Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.
Stop using vardenafil and get emergency medical help if you have sudden vision loss.