Xanax or Alprazolam comes into the benzodiazepine class. The reaction of Alprazolam affects the brain chemicals that treat people who are in anxiety. This medicine is used for the treatment of anxiety caused by depression, panic disorders, and anxiety disorders. Xanax can be used for various other purposes which are not mentioned over here. All the medicine shops do not sell Xanax, so you can buy Xanax online from any license holder online medicine website.