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Rifampin-induced hypothyroidism.

N Takasu¹, Y Kinjou, T Kouki

¹Department of Endocrinology and Metabolism, Second Department of Internal Medicine, University of the Ryukyus School of Medicine, Nishihara, Okinawa 902-0215, Japan. takasun@med.u-ryukyu.ac.jp

Journal of Endocrinological Investigation

|September 8, 2006

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Rifampin can induce hypothyroidism in euthyroid patients with Hashimoto's thyroiditis. This drug-induced hypothyroidism is reversible upon rifampin discontinuation, highlighting a potential risk for at-risk patients.

Area of Science:

Endocrinology
Infectious Diseases
Pharmacology

Background:

Hashimoto's thyroiditis is an autoimmune condition affecting the thyroid gland.
Rifampin is a crucial antibiotic for treating tuberculosis.
Euthyroid patients with Hashimoto's thyroiditis are generally considered stable regarding thyroid function.

Observation:

This study observed 67 tuberculosis patients treated with rifampin.
25 patients had pre-existing Hashimoto's thyroiditis (positive anti-thyroid antibodies).
Three euthyroid patients with Hashimoto's thyroiditis developed hypothyroidism during rifampin treatment.

Findings:

Rifampin administration led to elevated TSH levels in three euthyroid patients with Hashimoto's thyroiditis.
These three patients developed clinically significant hypothyroidism.

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Hypothyroidism resolved upon cessation of rifampin therapy, indicating a drug-induced effect.

Implications:

Rifampin poses a risk of inducing hypothyroidism in susceptible individuals, particularly those with Hashimoto's thyroiditis.
Monitoring thyroid function is crucial for patients on rifampin, especially those with autoimmune thyroid disease.
Discontinuation of rifampin can reverse rifampin-induced hypothyroidism.