Olapatadine is a medication used to treat allergic conjunctivitis. As with any medication, there may be impurities present in the product. These impurities could include residual solvents, degradation products, or other potentially harmful substances. It is important for manufacturers to carefully monitor and control impurities in order to ensure the safety and efficacy of the medication for patients. Regulatory agencies also require strict limits on impurities in pharmaceutical products.