Displaying 10 results of Nifedipine Impurities Nifedipine is a calcium channel blocker that is used to treat hypertension and angina. However, during the synthesis process, impurities may be introduced that can affect the purity and quality of the final product. These impurities can be harmful to human health and may also impact the efficacy of the drug. Therefore, it is important to monitor and control the levels of impurities in nifedipine to ensure its safety and effectiveness.