What are the two major groups of anesthetic agents?

What are the two major groups of anesthetic agents?

• A. amides and esthers
• B. alkaloids and analgesics
• C. esters and ethers
• D. opioids and NSAIDs

Answer: (A)

Two major groups of local anesthetic agents are amides and esters. This split is based on the chemical bond linking the anesthetic molecule: amide-type anesthetics have an amide bond, while ester-type anesthetics have an ester bond. This distinction matters clinically because it largely determines metabolism and duration of action—amide anesthetics are mainly metabolized in the liver by amidases and tend to have longer duration, whereas ester anesthetics are rapidly hydrolyzed by plasma cholinesterases and typically act for a shorter period. Examples to remember: lidocaine, bupivacaine, and mepivacaine are amides; procaine, benzocaine, and tetracaine are esters. Other pairings like esters and ethers or opioids and NSAIDs aren’t the standard way to categorize local anesthetics.

Two major groups of local anesthetic agents are amides and esters. This split is based on the chemical bond linking the anesthetic molecule: amide-type anesthetics have an amide bond, while ester-type anesthetics have an ester bond. This distinction matters clinically because it largely determines metabolism and duration of action—amide anesthetics are mainly metabolized in the liver by amidases and tend to have longer duration, whereas ester anesthetics are rapidly hydrolyzed by plasma cholinesterases and typically act for a shorter period. Examples to remember: lidocaine, bupivacaine, and mepivacaine are amides; procaine, benzocaine, and tetracaine are esters. Other pairings like esters and ethers or opioids and NSAIDs aren’t the standard way to categorize local anesthetics.