Amoxapine is a tricyclic antidepressant drug used in the treatment of major depressive disorder. During the manufacturing process, impurities may be formed which could affect the safety and efficacy of the drug. These impurities could include degradation products, starting materials, or by-products. Therefore, it is important to monitor and control the levels of these impurities to ensure the quality and safety of the final product. Analytical methods such as high-performance liquid chromatography (HPLC) are commonly used to detect and quantify these impurities.