Buy Xanax online is the brand name of the drug Alprazolam and is prescribed to be taken to treat anxiety and panic disorders, specifically generalized anxiety disorder (GAD). The drug belongs to a class of drugs called benzodiazepines, which act as a central nervous system (CNS) depressant. The drug works by enhancing the effects of a neurotransmitter called GABA (gamma-aminobutyric acid) which contributes majorly to motor control, vision, and many other functions related to the outer layer of the brain. Xanax is of 3 types Xanax 1mg, Xanax 2mg, Xanax Xr 3mg.