Easy-to-read patient leaflet for Levitra. Includes What do I need to tell my doctor BEFORE I take Levitra? Very bad dizziness or passing out. Drug Information on Levitra, Staxyn (vardenafil) includes drug pictures, side a light-headed feeling, like you might pass out;; penis erection that is painful or. Learn about the potential side effects of Levitra (vardenafil). Common (1% to 10%): Dizziness, paresthesia and dysesthesia, somnolence.