Levitra is used to treat erectile dysfunction (impotence). It works by helping to relax muscles and increase blood flow into the penis during sexual stimulation. This helps men to achieve and maintain an erection. Levitra samples may be obtained through a patient's doctor or health care provider. It can help patients to see if the drug works for them, or if another ED medication, such as Cialis or Viagra, might be a more viable treatment option. See here for more information.