Vardenafil is an oral drug used to treat male erectile dysfunction (ED) also referred to as impotence. Vardenafil shouldn't be taken more then once a day. Taken 60 minutes before intercourse Vardenafil remains active between 4 -20 hours. The success rate of oral ED drugs is very high, above 90%; however different people require different dosages to attain optimum results. Vardenafil has the same active ingredient as brand name Levitra, and is equivalent in effect, strength, and dosage.