Displaying 4 results of Fenoldopam Impurities Fenoldopam is a medication used to lower blood pressure in hospitalized patients. However, like any drug, fenoldopam can contain impurities that may affect its efficacy and safety. Fenoldopam impurities may include related substances, residual solvents, and degradation products. These impurities can be harmful to patients and need to be monitored and controlled during the drug manufacturing process.