Tiamulin is a veterinary antibiotic used to treat respiratory infections in pigs and poultry. Like all pharmaceutical products, tiamulin may contain impurities that can affect its safety and efficacy. Tiamulin impurities are unwanted substances that can be present in the drug substance or drug product, and may result from the manufacturing process, degradation, or interactions with other substances. The identification, characterization, and control of tiamulin impurities are important for ensuring the quality and safety of the drug, and are subject to regulatory requirements.