Xanax is the brand name for Alprazolam which produces a calming effect on the brain by literally slowing it down. The Xanax user might experience a drowsy feeling during the first few days until the body builds up a tolerance to the drug. This is an important factor of Xanax addiction because it is this tolerance that allows the user to take more and more of the drug to feel the same effects. Those with a Xanax addiction seek the drowsy feeling with a much higher intensity than normal people. The brain in those with a Xanax addiction associates Xanax with reward and stimulates pleasure centers that give the user feelings of euphoria that normal users do not experience.