Misoprostol is a medication used to prevent stomach ulcers in people who take nonsteroidal anti-inflammatory drugs (NSAIDs). Misoprostol impurities refer to any unwanted substances or chemicals present in the drug that may affect its purity, safety, or efficacy. These impurities can result from the manufacturing process or from storage conditions, and they can potentially cause harm to patients. Therefore, it is important to control and monitor the levels of misoprostol impurities to ensure the quality and safety of the medication.