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The effects of ranitidine on pituitary-thyroid function.

K R Hine, J S Harrop, M R Hopton

    British Journal of Clinical Pharmacology
    |October 1, 1984
    PubMed
    Summary
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    Ranitidine shows minimal impact on thyroid function tests in patients with peptic ulcer disease. While minor fluctuations in thyroid hormones occurred, diagnostic accuracy remains unaffected by this medication.

    Area of Science:

    • Endocrinology
    • Pharmacology

    Background:

    • Limited research exists on ranitidine's effects on pituitary-thyroid function compared to cimetidine.
    • Peptic ulcer disease patients often require medications affecting gastrointestinal and potentially endocrine systems.

    Purpose of the Study:

    • To investigate the impact of oral ranitidine on pituitary-thyroid function in patients with peptic ulcer disease.
    • To assess ranitidine's influence on thyroid-stimulating hormone (TSH), prolactin, and thyroid hormone levels.

    Main Methods:

    • 10 patients with peptic ulcer disease received oral ranitidine.
    • Measurements included TSH and prolactin responses to TSH-releasing hormone (TRH).
    • Serum total and free thyroxine (TT4, FT4) and triiodothyronine (TT3, FT3) levels were analyzed.

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    Main Results:

    • No significant changes were observed in TSH or prolactin responses to TRH.
    • Slight, non-significant declines in TT4 and FT4 concentrations were noted.
    • Slight, non-significant increases in TT3 and FT3 concentrations were observed.
    • A statistically significant decline (P < 0.05) was found in the TT4/TT3 and FT4/FT3 ratios.

    Conclusions:

    • Ranitidine may exert a minor influence on peripheral thyroxine deiodination.
    • Ranitidine has minimal effect on thyroid hormone production.
    • Biochemical tests of thyroid function retain diagnostic value in patients taking ranitidine.