Buy Xanax Online, Alprazolam, co mmonly marketed under the brand name Xanax, is a prescription benzodiazepine medication primarily used to treat anxiety disorders, panic attacks, and insomnia. It functions by depressing the central nervous system (CNS), amplifying the effects of gamma-aminobutyric acid (GABA)—a neurotransmitter that helps regulate overactive brain signals, promoting relaxation and sedation.