Which local anesthetic is repeatedly noted for methemoglobinemia risk?

Which local anesthetic is repeatedly noted for methemoglobinemia risk?

• A. Prilocaine
• B. Lidocaine
• C. Mepivacaine
• D. Bupivacaine

Answer: (A)

Prilocaine is repeatedly noted for methemoglobinemia risk because it is metabolized to o-toluidine, a potent oxidizing agent that converts hemoglobin from Fe2+ to Fe3+ (methemoglobin). Methemoglobinemia reduces the blood’s oxygen-carrying capacity, and the risk increases with higher doses or in susceptible individuals (like infants or those with limited methemoglobin reductase activity). Among the options, lidocaine, mepivacaine, and bupivacaine are not as strongly associated with methemoglobinemia in typical clinical use, so prilocaine stands out as the one most repeatedly linked to this adverse effect.

Prilocaine is repeatedly noted for methemoglobinemia risk because it is metabolized to o-toluidine, a potent oxidizing agent that converts hemoglobin from Fe2+ to Fe3+ (methemoglobin). Methemoglobinemia reduces the blood’s oxygen-carrying capacity, and the risk increases with higher doses or in susceptible individuals (like infants or those with limited methemoglobin reductase activity). Among the options, lidocaine, mepivacaine, and bupivacaine are not as strongly associated with methemoglobinemia in typical clinical use, so prilocaine stands out as the one most repeatedly linked to this adverse effect.