Norlidocaine Hydrochloride is the primary metabolite of lidocaine and is primarily used in research settings to study the pharmacokinetics, metabolism, and mechanisms of action of local anesthetics. It is employed in pharmacological studies to investigate sodium channel blockade in nerve cells and its role in pain signal prevention. This compound helps explore the efficacy, safety, and structure-activity relationships of lidocaine derivatives. It is also utilized in analytical chemistry as a reference standard for assays and in drug development for understanding metabolite contributions to therapeutic effects, though it is not commonly used as a direct clinical anesthetic.