Displaying 8 results of Benzocaine Impurities Benzocaine is a local anesthetic commonly used in medical and dental procedures. However, like all chemicals, benzocaine can contain impurities that may impact its safety and effectiveness. Common benzocaine impurities include residual solvents, heavy metals, and organic contaminants. It is important to conduct thorough quality control testing to ensure the purity of benzocaine and minimize potential risks to patients.