Pretomanid is an important drug used in the treatment of tuberculosis. However, the drug may contain impurities that can impact its potency and safety. Pretomanid impurities refer to any substances that are present in the drug that are not the active pharmaceutical ingredient. These impurities can be the result of manufacturing processes or degradation of the drug over time. It is important to monitor and control these impurities to ensure the safety and efficacy of the drug.