Which amide local anesthetic has an ester component as part of its structure?

Which amide local anesthetic has an ester component as part of its structure?

• A. Articaine
• B. Lidocaine
• C. Prilocaine
• D. Mepivacine

Answer: (A)

Articaine stands out because its molecule contains an ester linkage in addition to the amide bond. That ester component lets articaine be rapidly hydrolyzed by plasma esterases, so it behaves, pharmacokinetically, with ester-type breakdown even though it’s classified as an amide local anesthetic. The other commonly used amide anesthetics—lidocaine, prilocaine, and mepivacaine—do not have an ester bond and are primarily metabolized in the liver by amidases. So, the ester component in articaine’s structure is what makes it unique among these options.

Articaine stands out because its molecule contains an ester linkage in addition to the amide bond. That ester component lets articaine be rapidly hydrolyzed by plasma esterases, so it behaves, pharmacokinetically, with ester-type breakdown even though it’s classified as an amide local anesthetic. The other commonly used amide anesthetics—lidocaine, prilocaine, and mepivacaine—do not have an ester bond and are primarily metabolized in the liver by amidases. So, the ester component in articaine’s structure is what makes it unique among these options.