Displaying 5 results of Protriptyline Impurities Protriptyline is an antidepressant medication that works by increasing the levels of certain neurotransmitters in the brain. However, during the manufacturing process, impurities may be formed. These impurities can have adverse effects on the quality, purity, and safety of the final product. Therefore, it is important to identify and quantify these impurities to ensure that the medication is safe and effective for patients.