Which of the following is not a common ester local anesthetic?

Lidocaine is not a common ester local anesthetic; it is classified as an amide local anesthetic. The distinction between esters and amides in local anesthetics is based on their chemical structure. Ester local anesthetics, such as procaine, benzocaine, and tetracaine, have a specific ester linkage in their chemical composition, which influences their metabolism and potential for allergic reactions. In contrast, amide local anesthetics, like lidocaine, possess an amide linkage, leading to different pharmacokinetic properties and a lower incidence of allergic reactions compared to their ester counterparts. Understanding this classification is crucial for practitioners in selecting appropriate anesthetics based on patient needs and potential complications.