Tetrabenazine is a medication used to treat movement disorders. However, the drug may contain impurities that can affect its efficacy and safety. These impurities can be various types of chemical compounds, including degradation products, residual solvents, and other organic and inorganic substances. Therefore, it is essential to monitor and control the levels of Tetrabenazine impurities during its production and storage to ensure its quality and purity.