Which statement about acetaminophen's risk is true?

Which statement about acetaminophen's risk is true?

• A. It can cause liver damage in high or chronic use
• B. It has no risk of organ toxicity
• C. It only affects the heart
• D. It is more dangerous than morphine in all cases

Answer: (A)

Acetaminophen can damage the liver when taken in high amounts or used chronically. Most of the drug is safely processed and eliminated, but a portion is converted to a reactive metabolite (NAPQI). Normally NAPQI is detoxified by glutathione, but if dosing is excessive or glutathione is depleted (as with chronic heavy alcohol use, malnutrition, or certain drug interactions), NAPQI accumulates and injures liver cells, leading to hepatotoxicity. This is why keeping within recommended daily limits is crucial and why alcohol use and prolonged high-dose use increase the risk. The statement that there is no risk of organ toxicity is incorrect, and saying it only affects the heart is inaccurate. The idea that it is always more dangerous than morphine ignores context and dosing; both drugs have distinct risk profiles depending on how they are used.

Acetaminophen can damage the liver when taken in high amounts or used chronically. Most of the drug is safely processed and eliminated, but a portion is converted to a reactive metabolite (NAPQI). Normally NAPQI is detoxified by glutathione, but if dosing is excessive or glutathione is depleted (as with chronic heavy alcohol use, malnutrition, or certain drug interactions), NAPQI accumulates and injures liver cells, leading to hepatotoxicity. This is why keeping within recommended daily limits is crucial and why alcohol use and prolonged high-dose use increase the risk. The statement that there is no risk of organ toxicity is incorrect, and saying it only affects the heart is inaccurate. The idea that it is always more dangerous than morphine ignores context and dosing; both drugs have distinct risk profiles depending on how they are used.