Vardenafil’s relatively short effective time is comparable to but somewhat longer than sildenafil’s. Swallow several times as the tablet dissolves. Call your doctor for medical advice about side effects. Use the medicine exactly as directed. Tadalafil is structurally different from both sildenafil and vardenafil.vardenafil (Levitra) avanafil (Stendra) About 30 million men in the United States occasionally have a problem with getting or keeping an erection, according to the . Levitra (vardenafil) is a brand name medication used to treat symptoms of erectile dysfunction (ED), a condition which affects millions of people worldwide. ED .  · Descriptions. Vardenafil is used to treat men with erectile dysfunction (sexual impotence). It belongs to a group of medicines called phosphodiesterase 5 (PDE5) .