There is a greater chance of overdose with this type of local anesthesia.

There is a greater chance of overdose with this type of local anesthesia.

• A. Ester
• B. Amide
• C. Vasoconstrictor
• D. Topical

Answer: (B)

Amide local anesthetics have a higher potential for systemic overdose because they are metabolized in the liver and can accumulate in the bloodstream, especially with large or prolonged doses or in patients with impaired liver function. Unlike esters, which are rapidly broken down by plasma cholinesterase and have shorter durations, amides stay in the system longer, so a mistake in dosing or distribution can lead to toxic plasma levels. Using a vasoconstrictor helps by reducing systemic absorption, lowering overdose risk for any agent. Topical forms can be absorbed through mucosa, but the class difference—amide versus ester—primarily drives the relative overdose risk, with amides being more prone to systemic toxicity in practice due to hepatic metabolism and longer duration.

Amide local anesthetics have a higher potential for systemic overdose because they are metabolized in the liver and can accumulate in the bloodstream, especially with large or prolonged doses or in patients with impaired liver function. Unlike esters, which are rapidly broken down by plasma cholinesterase and have shorter durations, amides stay in the system longer, so a mistake in dosing or distribution can lead to toxic plasma levels. Using a vasoconstrictor helps by reducing systemic absorption, lowering overdose risk for any agent. Topical forms can be absorbed through mucosa, but the class difference—amide versus ester—primarily drives the relative overdose risk, with amides being more prone to systemic toxicity in practice due to hepatic metabolism and longer duration.