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Amiodarone has both direct and indirect effects on thyroid function. The most notable indirect thyroid altering property is that the drug is approximately one-third iodine by weight. As a result, amiodarone therapy elevates free circulating iodine levels up to 40 times greater than the iodine intake from the average American diet. [2]
Both of these factors contribute to the effects of amiodarone on thyroid function. [20] [45] [47] [48] Amiodarone also causes an anti-thyroid action, via Plummer and Wolff–Chaikoff effects, due its large amount of iodine in its molecule, which causes a particular "cardiac hypothyroidism" with bradycardia and arrhythmia. [49] [50]
The Wolff–Chaikoff effect is known as an autoregulatory phenomenon that inhibits organification in the thyroid gland, the formation of thyroid hormones inside the thyroid follicle, and the release of thyroid hormones into the bloodstream. [6] This becomes evident secondary to elevated levels of circulating iodide.
In some ways the Jod-Basedow phenomenon is the opposite of two physiological compensation mechanisms, the Plummer effect and the Wolff–Chaikoff effect, which in normal persons and in persons with thyroid disease, suppress the thyroid hormone after ingestion of large quantities of iodine or iodide. However, unlike the Plummer and Wolff ...
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]
Mounjaro vs. Ozempic: Which Is Better for Weight Loss? This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. In one corner, we’ve got Mounjaro, and in the other, Ozempic.