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Acetaminophen: a practical pharmacologic overview.

C H Jackson, N C MacDonald, J W Cornett

    Canadian Medical Association Journal
    |July 1, 1984
    PubMed
    Summary
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    Acetaminophen overdose can cause liver damage by depleting glutathione, which normally neutralizes a toxic intermediate. Prompt antidotal therapy significantly reduces the severity of acetaminophen-induced liver injury.

    Area of Science:

    • Pharmacology
    • Hepatology
    • Toxicology

    Background:

    • Acetaminophen is a widely used analgesic and antipyretic.
    • Its metabolism primarily occurs in the liver, producing non-toxic byproducts.
    • A minor metabolic pathway generates a toxic intermediate, usually inactivated by glutathione.

    Purpose of the Study:

    • To elucidate the mechanism of acetaminophen-induced liver toxicity.
    • To define the plasma concentration threshold for hepatotoxicity.
    • To describe the clinical course and outcomes of acetaminophen poisoning.

    Main Methods:

    • Review of metabolic pathways of acetaminophen.
    • Analysis of toxic intermediate formation and glutathione depletion.
    • Correlation of plasma acetaminophen concentrations with liver damage.

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  • Clinical observation of poisoning progression and response to treatment.

    • Main Results:

    • Acetaminophen overdose depletes hepatic glutathione, allowing a toxic intermediate to damage liver cells.
    • Hepatotoxicity is unlikely below plasma concentrations of 150 µg/mL, far exceeding therapeutic levels (5-20 µg/mL).
    • Acetaminophen poisoning presents with initial nonspecific symptoms, a latent phase with rising transaminases, and potentially severe hepatic dysfunction 3-5 days post-ingestion.

    Conclusions:

    • Acetaminophen-induced liver injury is primarily associated with acute overdose, not long-term therapeutic use.
    • The severity of liver damage is concentration-dependent and linked to glutathione depletion.
    • Effective antidotal therapy can significantly mitigate the initial liver damage and improve outcomes.