Displaying 2 results of Oseltamivir Phosphate Impurities Oseltamivir Phosphate is a drug used to treat influenza. However, the drug may contain impurities that can affect its safety and efficacy. These impurities may include related substances, isomers, residual solvents, and heavy metals. It is important to identify and control these impurities to ensure the quality and safety of the drug product. The use of validated analytical methods and strict quality control measures is necessary to ensure compliance with regulatory requirements.