Displaying 21 results of Cimetidine Impurities Cimetidine is an anti-ulcer drug that is used to treat gastrointestinal disorders. However, during the manufacturing process, impurities can be introduced into the drug substance that can affect its safety and efficacy. Cimetidine impurities can include degradation products, process-related impurities, and other contaminants. It is important to monitor and control these impurities to ensure the quality and safety of the final product.