Nystatin is an antifungal medication used to treat various infections caused by yeast and fungi. However, during the manufacturing process, impurities may be introduced, which can affect the quality and safety of the drug. These impurities can include residual solvents, by-products, or degradation products, and must be carefully monitored and controlled to ensure the drug is effective and safe for patients. Analytical methods are used to detect and quantify these impurities, and strict regulations are in place to ensure that Nystatin meets quality standards.