Buy Xanax online as a member of the benzodiazepine class of medications. Patients use Xanax to treat and manage anxiety and panic disorders. It is the most prescribed psychiatric (mental disorder) medication in the United States. They slow down the movement of the brain chemicals that are unbalanced in people with anxiety. Alprazolam works by boosting the impact of brain neurotransmitters GABA (gamma-aminobutyric acid) to impart the effects of calmness and relaxation.