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Related Experiment Videos

Recurrent agranulocytosis induced by two different antithyroid agents.

B Chen, R Lang, Y Jutrin

    The Medical Journal of Australia
    |July 9, 1983
    PubMed
    Summary

    A patient experienced agranulocytosis (a dangerous drop in white blood cells) after taking both propylthiouracil and methimazole for thyrotoxicosis. This rare case highlights potential cross-reactivity of antithyroid drugs.

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    Area of Science:

    • Endocrinology
    • Hematology
    • Pharmacology

    Background:

    • Thyrotoxicosis, a condition of excess thyroid hormones, is often treated with antithyroid medications.
    • Propylthiouracil (PTU) and methimazole are common treatments, but can have serious side effects.
    • Agranulocytosis is a rare but life-threatening adverse effect of these medications.

    Observation:

    • A 45-year-old woman with thyrotoxicosis developed agranulocytosis while on propylthiouracil.
    • Following recurrence of thyrotoxicosis and a psychotic reaction, methimazole was prescribed.
    • The patient subsequently developed agranulocytosis again, 10 weeks after starting methimazole.

    Findings:

    • This case represents the first documented instance of agranulocytosis occurring in the same patient after treatment with both propylthiouracil and methimazole.

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  • The findings suggest a potential cross-reactivity or shared mechanism leading to agranulocytosis between these two antithyroid drugs.
  • The patient's severe psychotic reaction may have been linked to the thyrotoxicosis or the medication side effect.

    • Implications:

    • Clinicians should be aware of the potential for cross-reactivity between PTU and methimazole regarding agranulocytosis.
    • Careful monitoring for hematological adverse effects is crucial in patients treated with either antithyroid drug, especially if switched between them.
    • This case underscores the importance of considering drug-induced agranulocytosis in patients presenting with severe neutropenia during antithyroid therapy.