Surgery If a patient is absolutely allergic to LA, the specific drug used in place of it is: A Chlorpheniramine maleate B Benzalkonium chloride C Diphenhydramine hydrochloride D Ketamine hydrochloride π‘ Explanation If a patient is absolutely allergic to LA, the specific drug used in place of it is: β Correct Answer: C. Diphenhydramine hydrochloride