Displaying 4 results of Sulfadoxine Impurities Sulfadoxine is a sulfonamide antibiotic used to treat and prevent malaria. However, during the manufacturing process, impurities may be formed, which can affect the quality and safety of the drug. Some of the known impurities of Sulfadoxine include related substances such as Sulfamethoxypyridazine, Sulfadoxine-N-oxide, and Sulfadoxine-6-hydroxy. These impurities need to be monitored and controlled to ensure the safety and efficacy of the drug product.