Mevastatin impurities are chemical compounds that may be present in mevastatin, a medication used to lower cholesterol. These impurities can affect the safety and efficacy of the drug and must be closely monitored and controlled during the manufacturing process. Mevastatin impurities can include related substances, degradation products, and other contaminants that may arise during synthesis or storage. Analytical methods are used to identify and quantify these impurities to ensure that mevastatin is safe and effective for patients.