Displaying 10 results of Fidaxomicin Impurities Fidaxomicin is an antibiotic drug used to treat Clostridium difficile infections. Impurities in Fidaxomicin are unwanted substances that may be present in the drug, and can affect its safety, efficacy, and quality. These impurities can be formed during the manufacturing process, storage, or degradation of the drug. It is important to control the levels of impurities in Fidaxomicin to ensure the safety and efficacy of the drug.