Displaying 2 results of Azelnidipine Impurities Azelnidipine is a calcium channel blocker used to treat hypertension. However, during the manufacturing process, impurities may be formed which can affect the quality, safety, and efficacy of the drug. These impurities may include related substances, degradation products, and residual solvents. Therefore, it is important to monitor and control the levels of these impurities to ensure the drug's purity and safety for patients.