Xenazine is a drug that belongs to the central nervous system agents. Xenazine has an active ingredient called tetrabenazine. Xenazine ideally is used to treat the symptoms of Huntington's disease. These symptoms include the uncontrollable movements associated with Huntington's, also known as chorea. This will help the patients that are suffering from Huntington's diseases to carry on with their daily routines. Xenazine treats these symptoms by reducing the availability of certain chemicals in the brain like dopamine that causes excitation of the neurones.