Displaying 12 results of Norepinephrine Impurities Norepinephrine is a neurotransmitter that plays a vital role in regulating the function of the sympathetic nervous system. However, during its production, impurities may arise which can impact the quality and efficacy of the final product. These impurities can include related impurities, degradation products, and residual solvents. It is important to identify and quantify these impurities to ensure the safety and effectiveness of medications containing norepinephrine.