Mirtazapine is a medication used to treat depression and anxiety disorders. However, during its production process, impurities may be formed. These impurities can be harmful and can affect the efficacy and safety of the medication. Therefore, it is essential to monitor and control the impurities in the production process to ensure the quality of the medication. The most common impurities found in Mirtazapine are related to the starting materials used in the synthesis, and their levels are regulated by international standards.