Xanax Is Used For the Treatment of Anxiety and Panic disorder. It calms down your nervous system. Xanax belongs to a class of drugs called benzodiazepines. It works by lessening abnormal excitement in the brain and the effects of certain natural chemicals in the body. Xanax Can act As muscle relax and it relaxes your mood. It helps to balance out chemicals in our body. Do not take it more often than directed.