Displaying 2 results of Codeine Impurities Codeine is a potent painkiller used to treat mild to moderate pain. However, during the manufacturing process, impurities can sometimes be introduced, which may pose a health risk to patients. These impurities can be anything from residual solvents to by-products of synthesis, and can lead to adverse effects such as allergic reactions, toxicity, and even cancer. Therefore, it is important for pharmaceutical companies to closely monitor and control codeine impurities to ensure the safety and efficacy of the drug.