Xanax is the brand name of the drug alprazolam, which falls in the category of drugs called benzodiazepines, which act as central nervous system (CNS) depressant. When people buy Xanax online, it is prescribed to treat anxiety and panic disorders, specifically generalized anxiety disorder (GAD). However, one must remember that no matter how much the drug is prescribed, it still comes with its own set of effects and side effects, and the same goes for Xanax.