Displaying 5 results of Morphine Impurities Morphine impurities refer to any substance that is present in morphine which is not the active ingredient. These impurities can affect the quality, purity and potency of the drug. Some common morphine impurities include codeine, thebaine, papaverine and noscapine. It is important to monitor and control these impurities to ensure the safety and effectiveness of morphine for medical use.