Atomoxetine is a drug used to treat attention deficit hyperactivity disorder (ADHD). However, during the manufacturing process, impurities can be introduced into the drug that may affect its safety and efficacy. These impurities can be organic or inorganic in nature and can arise from starting materials, reagents, or the manufacturing process itself. Therefore, it is important to monitor and control impurities in atomoxetine to ensure the safety and efficacy of the drug.