Ropivacaine HCLNaropin Injection contains ropivacaine HCl, which is a member of the amino amide class of local anesthetics. Naropin Injection is a sterile, isotonic solution that contains the enantiomerically pure drug substance, sodium chloride for isotonicity and Water for Injection. Sodium hydroxide and/or hydrochloric acid may be used for pH adjustment. It is administered. Parenterally. Ropivacaine HCl is chemically described as S-(-)-1-propyl-2',6'-pipecoloxylidide. Hydrochloride monohydrate. The drug substance is a white crystalline powder, with a molecular