Order Xanax XR 3mg is the brand name for alprazolam, a prescription medication belonging to the benzodiazepine class of drugs. It is primarily prescribed to manage anxiety disorders, panic disorders, and short-term relief of anxiety symptoms. Alprazolam acts by increasing the effect of a neurotransmitter in the brain called GABA (gamma-aminobutyric acid), which results in a calming, sedative effect.