Vardenafil is found as the active ingredient of the name. Used to treat erectile dysfunction. Take vilitra tablet one hour before sexual intercourse. The effect of this drug lasts for 4 to 6 hours. If the effect of this medicine lasts for more than 4 hours, consult a doctor immediately. The drug is manufactured at Centurion Lab in India. Do not take vilitra 20 if you are taking nitrate medicine. Because of the serious side effects.