Quetiapine Impurities are the unwanted substances that may be present in Quetiapine drug products. These impurities can arise during the synthesis, manufacturing, or storage of the drug. Some impurities may be harmful to human health, while others may not have any significant effect. It is essential to monitor and control the levels of impurities in Quetiapine drug products to ensure the safety and efficacy of the medication. The regulatory authorities have set limits for the maximum allowable levels of impurities in Quetiapine drug products.