Xanax is a benzodiazepine, and it is thought that alprazolam works by enhancing the activity of certain neurotransmitters in the brain.buy Xanax online, which is used to treat anxiety disorders and anxiety caused by depression. It is a prescribed medicine used to treat anxiety and panic disorders and anxiety associated with depression. Xanax or its generic version of alprazolam does not affect everyone in the same way. Xanax is used to cure anxiety and panic disorders, and it refers to a class of drugs called benzodiazepines which work on the brain and nerves to produce a future effect.