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  • Title: The effect of spironolactone on thyroid autoimmunity in euthyroid men with Hashimoto's thyroiditis.
    Author: Krysiak R, Kowalcze K, Okopień B.
    Journal: J Clin Pharm Ther; 2020 Feb; 45(1):152-159. PubMed ID: 31520539.
    Abstract:
    WHAT IS KNOWN AND OBJECTIVE: Hashimoto's thyroiditis, also referred to as autoimmune thyroiditis, is characterized by sexual dimorphism, suggesting an important role of sex hormones in its development. No interventional study has investigated whether drugs exerting antiandrogen properties affect thyroid antibody titres and thyroid function tests in subjects with autoimmune thyroiditis. METHODS: This study included 35 levothyroxine-naïve men with euthyroid Hashimoto's thyroiditis. At the physician's discretion, 18 men were then treated with spironolactone (50-200 mg daily), while the remaining patients (n = 17) received other diuretics. Serum levels of thyrotropin, free thyroid hormones, testosterone and 25-hydroxyvitamin D, as well as titres of thyroid peroxidase and thyroglobulin, were measured at the beginning of the study and 6 months later. Based on hormone levels, constant structure parameters of thyroid homeostasis were calculated. RESULTS AND DISCUSSION: At baseline, there was no difference between the treatment arms in terms of thyroid antibody titres, hormone levels and the calculated parameters of thyroid homeostasis. Thirty-two patients completed the study. Spironolactone increased thyroid antibody titres, decreased testosterone and 25-hydroxyvitamin D levels and reduced SPINA-GT. The drug produced a neutral effect on serum levels of thyrotropin, free thyroid hormones, Jostel's thyrotropin index and SPINA-GD. The effect of spironolactone on antibody titres correlated with treatment-induced changes in SPINA-GT, testosterone and 25-hydroxyvitamin D. No significant changes in antibody titres, hormone levels and the calculated parameters of thyroid homeostasis were observed in spironolactone-naïve men. WHAT IS NEW AND CONCLUSION: The obtained results indicate that spironolactone may exert an unfavourable effect on progression of autoimmune thyroiditis in men.
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