Alprazolam is used to treat anxiety and panic disorders. It belongs to a class of medications called Benzodiazepines, which act on the brain and nerves in the CNS to produce a calming effect. It works by enhancing the effects of a certain natural chemical in the body (GABA). Xenax is available in various doses and forms. But commonly they are used as tablets. Available as Tablets, Capsules and pills. Xenax is the brand name of Alprazolam. They are scored, or indented, in three places, so one pill can be broken into four 0.25-mg pieces. There are also a number of similar looking generic versions of the drug. Alprazolam is fully available after oral administration and kinetic parameters are not affected by route of administration. With the exception of rapidity of onset, the pharmacodynamic profiles of IV and oral alprazolam are very similar after a 1.0-mg dose.