Levitra (vardenafil) is a highly-efficient drug with a just few side effects that helps men suffering from erectile dysfunction (inability to hold their erection for long enough to complete sexual intercourse) to regain some of their sexual power. In clinical studies this medicine has been reported to be efficient in 80% of all cases – a very good result for an erectile dysfunction treatment medicine. The effects of Levitra last for up to 5 hours, although in most cases they start to decrease after 2 hours. That’s why it’s recommended to take this drug about an hour before having sex to provide for maximum efficiency. This medicine should be taken only by people to whom it was prescribed. It is not intended for children, women or men who did not consult their health care provider and did not obtain a prescription. Sometimes patients do not need to take Levitra even though they believe they do.