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Hepatotoxicity from antithyroid drugs.

A C Vitug, J M Goldman

    Hormone Research
    |January 1, 1985
    PubMed
    Summary

    Low-dose methimazole is safer for liver function than propylthiouracil, especially in patients over 40. Propylthiouracil-induced liver injury is more common in younger individuals, with both drugs posing risks early in treatment.

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    Area of Science:

    • Endocrinology
    • Hepatology
    • Pharmacology

    Background:

    • Thyroid dysfunction is commonly treated with antithyroid drugs like propylthiouracil and methimazole.
    • Both propylthiouracil and methimazole are associated with serious adverse events, including hepatotoxicity and agranulocytosis.
    • Understanding the comparative safety profiles of these drugs is crucial for clinical decision-making.

    Purpose of the Study:

    • To review and compare cases of hepatic injury associated with propylthiouracil, methimazole, and carbimazole.
    • To compare the incidence and characteristics of drug-induced liver injury (DILI) with previously reported agranulocytosis data.
    • To identify patient demographics and clinical features associated with hepatotoxicity from these antithyroid medications.

    Main Methods:

    • Systematic literature review of English-language publications on propylthiouracil, methimazole, and carbimazole-induced hepatic injury.
    • Comparative analysis of hepatotoxicity data with existing data on agranulocytosis.
    • Analysis of patient age, drug dosage, timing of onset, and type of liver injury.

    Main Results:

    • Low-dose methimazole demonstrated a safer profile regarding hepatotoxicity compared to propylthiouracil.
    • Methimazole-induced liver injury was more prevalent in patients over 40 years old.
    • Propylthiouracil-induced hepatotoxicity was more frequently observed in younger patients.
    • The majority of hepatic injury cases for both drugs occurred within the first few months of therapy.
    • Methimazole predominantly caused cholestatic hepatitis, while propylthiouracil was associated with cytotoxic hepatitis.

    Conclusions:

    • Low-dose methimazole is generally safer than propylthiouracil concerning liver injury, particularly for older adults.
    • Age influences the risk profile for hepatotoxicity, with younger patients being more susceptible to propylthiouracil and older patients to methimazole.
    • The distinct patterns of cholestatic versus cytotoxic hepatitis induced by methimazole and propylthiouracil, respectively, warrant further investigation.
    • Early monitoring for hepatic injury is recommended for patients initiating therapy with these antithyroid drugs.

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