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Abnormalities in thyroid function associated with chronic therapy with methadone.

T N English1, D Ruxton, C J Eastman

  • 1Sydney Diagnostic Services, North Ryde, Australia.

Clinical Chemistry
|November 1, 1988
PubMed
Summary
This summary is machine-generated.

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Methadone therapy can alter thyroid function tests, increasing total thyroxine (T4) and triiodothyronine (T3) levels due to higher thyroxine-binding globulin (TBG). Free thyroid hormone levels and TSH remain normal, confirming euthyroid status in patients on methadone.

Area of Science:

  • Endocrinology
  • Pharmacology
  • Clinical Chemistry

Background:

  • Methadone maintenance therapy is used for opioid withdrawal.
  • Thyroid function tests (TFTs) can be affected by various medications.
  • Understanding medication-induced thyroid abnormalities is crucial for accurate diagnosis.

Purpose of the Study:

  • To investigate thyroid function test abnormalities in patients undergoing methadone therapy.
  • To determine if methadone impacts thyroid hormone levels and binding proteins.
  • To identify reliable thyroid function tests for euthyroid patients on methadone.

Main Methods:

  • Studied 145 clinically euthyroid patients on maintenance methadone therapy.
  • Measured serum concentrations of total T3, total T4, thyroxine-binding globulin (TBG), T3 uptake (T3U), and free thyroxine index (FTI).

Related Experiment Videos

  • Utilized ultrasensitive thyrotropin (TSH-IRMA) and free T3 (FT3), free T4 (FT4) assays.

    • Main Results:

    • Approximately one-third of patients showed increased serum total T4 and T3 concentrations.
    • Mean serum T3, T4, and TBG levels were significantly higher in patients than controls (P < 0.001).
    • Free T3, free T4, and TSH-IRMA levels remained within normal limits, confirming euthyroid state.

    Conclusions:

    • Prolonged methadone therapy is associated with elevated serum TBG, T3, and T4 levels.
    • Free T3, free T4, and TSH-IRMA tests are recommended for accurate thyroid assessment in patients on methadone.
    • Methadone-induced changes in TFTs do not indicate hyperthyroidism in clinically euthyroid patients.