Levitra is also known as Vardenafil. You can buy Levitra 20 mg online it relaxes the muscles in the blood vessels and increases blood flow to the penis. Levitra increases the blood flow rate to the penis during sexual activities. Levitra is used to treat erectile dysfunction in men. Levitra did not prevent sexually transmitted diseases like HIV or it does not prevent pregnancy. It has some common normal side effects like headache, runny or stuffy nose, and back pain. You have to take Levitra 1 hour before the sexual activity to get better results.