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Related Experiment Videos

[Asymptomatic hepatitis induced by propylthiouracil].

J J De Castro1, E L Nobre, J Garcia e Costa

  • 1Serviço de Endocrinologia, Diabetes e Metabolismo, Hospital de Santa Maria, Lisboa.

Acta Medica Portuguesa
|March 7, 2002
PubMed
Summary
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Propylthiouracil (PTU) can cause rare, asymptomatic liver injury in hyperthyroidism patients. Diagnosis was confirmed by re-challenging with PTU, highlighting the need for vigilance and prompt drug discontinuation.

Area of Science:

  • Hepatology
  • Endocrinology
  • Clinical Pharmacology

Background:

  • Propylthiouracil (PTU) is a common treatment for hyperthyroidism.
  • Hepatotoxicity is a rare but serious adverse effect of PTU.
  • Previous reports of PTU-induced liver injury primarily involved symptomatic cases.

Observation:

  • A 20-year-old female with Graves' disease developed asymptomatic elevations in liver enzymes (AST, ALT, GGT) after 5 months of PTU therapy.
  • Liver enzymes normalized upon PTU discontinuation but recurred with asymptomatic elevations upon PTU re-challenge.
  • Laboratory findings included elevated liver enzymes without hyperbilirubinemia, a rare presentation.

Findings:

  • This case represents the second documented instance of asymptomatic PTU-induced hepatotoxicity confirmed by PTU re-challenge.

Related Experiment Videos

  • Re-challenge with PTU led to a recurrence of elevated liver enzymes, confirming PTU as the causative agent.
  • Methimazole (MMI) therapy resulted in normalization of liver enzymes and thyroid function.

    • Implications:

    • Clinicians should suspect PTU-induced hepatotoxicity in patients on PTU presenting with abnormal liver function tests, even if asymptomatic.
    • Prompt discontinuation of PTU is crucial upon detection of liver injury.
    • While recovery is typically complete, PTU-induced hepatotoxicity has been associated with fatalities.