Mupirocin is an antibiotic used to treat bacterial infections. Mupirocin impurities are impurities that may be present in the Mupirocin drug substance or drug product. These impurities could be related to the starting materials, the manufacturing process, or degradation products. The presence of impurities in the drug product could affect the quality, safety, and efficacy of the drug. Therefore, it is essential to identify and control these impurities during the drug development process.