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They inhibit release of thyroid hormones by the thyroid gland.The most studied drug in this class is lithium, which inhibits thyroid hormone secretion by inhibiting iodotyrosine coupling, thyroidal iodide uptake, and alteration in structure of thyroglobulin, [10] a protein which acts as a substrate for the synthesis of thyroid hormones and storage of inactive forms of T3, T4 and iodine within ...
Furthermore, reviewing their medications and possible dietary supplements is important, as several medications can affect thyroid hormone levels. [14] Levothyroxine is also used to treat subclinical hypothyroidism, which is defined by an elevated TSH level and a normal-range free T 4 level without symptoms. [14]
Amiodarone inhibits peripheral conversion of thyroxine to triiodothyronine; also interferes with thyroid hormone action. [citation needed] Lithium inhibits thyroid hormone release. [citation needed] Phenobarbitone, phenytoin, carbamazepine, rifampin induce metabolic degradation of triiodothyronine (T 3) and thyroxine (T 4). [citation needed]
Levothyroxine, a drug used to treat hypothyroidism, can lead to reduced bone mass and density in older adults with normal thyroid levels, a small cohort study has shown.
Certain medications can have the unintended side effect of affecting thyroid function. While some medications can lead to significant hypothyroidism or hyperthyroidism and those at risk will need to be carefully monitored, some medications may affect thyroid hormone lab tests without causing any symptoms or clinical changes, and may not require treatment.
Propylthiouracil is in the antithyroid family of medications. [4] It works by decreasing the amount of thyroid hormone produced by the thyroid gland and blocking the conversion of thyroxine (T4) to triiodothyronine (T3). [3] Propylthiouracil came into medical use in the 1940s. [5] It is on the World Health Organization's List of Essential ...