Displaying 2 results of Pyrimethamine Impurities Pyrimethamine is a medication used in the treatment of malaria and other parasitic infections. However, it may contain impurities that can adversely affect its efficacy and safety. These impurities can be formed during the manufacturing process and can include related substances, residual solvents, and heavy metals. It is important to monitor and control these impurities to ensure the quality and safety of pyrimethamine products.