Displaying 2 results of Alimemazine Impurities Alimemazine is an antihistamine drug used to treat allergies and itching. However, during the manufacturing process, impurities may be introduced that can affect the quality and safety of the drug. Alimemazine impurities can include degradation products, residual solvents, and other unwanted substances. Manufacturers must carefully monitor and control impurities to ensure the final product is safe and effective for patients.