Xenazine 25 refers to a medication that contains 25 milligrams of tetrabenazine as its active ingredient. It is primarily prescribed for the treatment of Huntington's disease, specifically to manage and reduce the severity of chorea — involuntary, rapid, and unpredictable movements that are a hallmark of this condition. Tetrabenazine works by depleting the brain's stores of certain neurotransmitters, such as dopamine, which are believed to be involved in the control of movement and coordination. This action helps to alleviate the symptoms of chorea, improving the quality of life for those affected by Huntington's disease. It is important for patients to follow their healthcare provider's instructions when taking Xenazine 25, as it can have side effects and may interact with other medications.