vardenafil (Levitra, Staxyn ODT) Uses, Side Effects Dosage - MedicineNet Vardenafil is an oral drug that is used to treat impotence, the inability to attain or maintain a penile erection It has a mechanism of action that is similar to sildenafil (Viagra), and tadalafil (Cialis) Penile erection is caused by the engorgement of the penis with blood