Displaying 7 results of Nitrofurantoin Impurities Nitrofurantoin is an antibacterial drug used to treat urinary tract infections. However, the drug may contain impurities that can pose health risks to patients. These impurities may include potentially carcinogenic compounds such as nitrosamines, as well as other impurities like metals and solvents. Manufacturers must ensure that their nitrofurantoin products are free from harmful impurities to ensure the safety and efficacy of the drug.