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Glyburide does not alter thyroid function.

M L England, J M Hartnell, J M Hershman

    Diabetes Research (Edinburgh, Scotland)
    |November 1, 1986
    PubMed
    Summary
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    This study found that glyburide, a sulfonylurea drug, did not affect thyroid function or size in Type 2 diabetic patients. Fasting serum glucose significantly decreased with glyburide treatment.

    Area of Science:

    • Endocrinology
    • Pharmacology
    • Metabolic Disorders

    Background:

    • Sulfonylurea therapy has been linked to goiter and hypothyroidism.
    • Glyburide is a newer generation sulfonylurea drug.
    • Understanding glyburide's impact on thyroid function is crucial for diabetic patient management.

    Purpose of the Study:

    • To investigate the effects of glyburide on thyroid function and size in male Type 2 diabetic patients.
    • To assess changes in thyroid hormones (T4, FT4I, T3, FT3I) and TSH reserve after glyburide treatment.
    • To correlate glycemic control with thyroid function parameters.

    Main Methods:

    • 15 male Type 2 diabetic patients were studied before and after 6 and 24 weeks of glyburide treatment.
    • Thyroid examination, serum thyroid hormone levels, fasting serum glucose (FSG), HbA1c, and TRH tests were performed.

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  • Patients served as their own controls, with all other hypoglycemic agents discontinued prior to the study.

    • Main Results:

    • Glyburide significantly reduced FSG at both 6 and 24-32 weeks.
    • No significant changes were observed in body weight, thyroid size, serum FT4I, FT3I, or basal TSH.
    • The integrated area under the TSH response curve showed a significant decrease in 8 patients at 24 weeks, with a positive correlation between FSG and TSH response area.

    Conclusions:

    • Glyburide treatment did not demonstrate an adverse effect on thyroid function or size in this cohort.
    • Significant improvements in glycemic control were observed with glyburide therapy.
    • Further research may be warranted to explore the observed TSH response changes in relation to glycemic control.