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Severe hepatotoxicity after therapeutic doses of acetaminophen

Oswald Moling1, Elena Cairon, Giovanni Rimenti

  • 1Division of Infectious Diseases, Ospedale Generale, Bolzano, Italy. molosw@hotmail.com

Clinical Therapeutics
|July 25, 2006
PubMed
Abstract

Insights

Severe liver injury from acetaminophen at therapeutic doses can occur, especially with risk factors. Prompt N-acetylcysteine treatment effectively resolved acetaminophen-induced hepatotoxicity in a patient with multiple comorbidities.

Area of Science:

  • Hepatology
  • Clinical Toxicology
  • Pharmacology

Background:

  • Acetaminophen overdose is a common cause of acute liver failure.
  • The association between therapeutic acetaminophen doses and severe hepatotoxicity remains controversial.
  • Multiple risk factors can increase susceptibility to acetaminophen-induced liver injury.

Observation:

  • A patient with HIV, hepatitis B, and hepatitis C presented with severe hepatotoxicity after taking acetaminophen 1,000 mg four times daily for four days.
  • The patient exhibited significantly elevated liver enzymes (AST, ALT) and a high prothrombin international normalized ratio.
  • Potential risk factors including chronic infections and malnutrition were present.

Findings:

  • Continuous intravenous N-acetylcysteine administration led to rapid clinical improvement.
  • Liver enzyme levels (AST, ALT) decreased dramatically within 11 days of treatment.
  • N-acetylcysteine was effective in treating severe hepatotoxicity in this patient.

Implications:

  • This case highlights the potential for severe liver injury even at therapeutic acetaminophen doses in patients with risk factors.
  • Early recognition and prompt N-acetylcysteine treatment are crucial for managing acetaminophen-induced hepatotoxicity.
  • Further research may clarify the precise mechanisms and risk stratification for acetaminophen hepatotoxicity at therapeutic doses.

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