Displaying 8 results of Hydralazine Impurities Hydralazine is an antihypertensive drug used to treat high blood pressure. However, the manufacturing process of hydralazine can lead to the formation of impurities that can affect the quality and safety of the drug. These impurities can include related substances, residual solvents, and heavy metals. It is important to monitor and control these impurities during the manufacturing process to ensure the purity and efficacy of hydralazine.