Oxfendazole is an anthelmintic drug used to control parasitic infections in animals. Oxfendazole impurities are the by-products or contaminants that may be present in the drug substance or drug product. These impurities can affect the quality, safety, and efficacy of the drug. Therefore, it is essential to monitor and control the levels of impurities to ensure the product's quality and safety. The most common impurities in Oxfendazole are related substances, degradation products, and residual solvents. Analytical methods such as HPLC and GC can be used to detect and quantify these impurities.