Which combination of factors would increase the risk of acetaminophen hepatotoxicity?

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Multiple Choice

Which combination of factors would increase the risk of acetaminophen hepatotoxicity?

Acetaminophen hepatotoxicity risk climbs when the dose is high, alcohol is used regularly, and there is preexisting liver disease. Exceeding the daily limit increases the amount of drug available to be processed through the pathway that forms the toxic metabolite NAPQI. Regular alcohol use induces enzymes like CYP2E1 that convert more acetaminophen into NAPQI and can also deplete glutathione, the molecule that detoxifies NAPQI. Preexisting liver disease already reduces the liver’s capacity to conjugate and detoxify acetaminophen and to handle oxidative stress from toxic metabolites. When all three factors are present, the liver’s ability to neutralize the harmful metabolite is overwhelmed, and the risk of severe hepatotoxicity is greatest.

Acetaminophen hepatotoxicity risk climbs when the dose is high, alcohol is used regularly, and there is preexisting liver disease. Exceeding the daily limit increases the amount of drug available to be processed through the pathway that forms the toxic metabolite NAPQI. Regular alcohol use induces enzymes like CYP2E1 that convert more acetaminophen into NAPQI and can also deplete glutathione, the molecule that detoxifies NAPQI. Preexisting liver disease already reduces the liver’s capacity to conjugate and detoxify acetaminophen and to handle oxidative stress from toxic metabolites. When all three factors are present, the liver’s ability to neutralize the harmful metabolite is overwhelmed, and the risk of severe hepatotoxicity is greatest.

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