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Hypothyroidism (also called underactive thyroid, low thyroid or hypothyreosis) is a disorder of the endocrine system in which the thyroid gland does not produce enough thyroid hormones. [3] It can cause a number of symptoms, such as poor ability to tolerate cold, extreme fatigue, muscle aches, constipation, slow heart rate, depression, and ...
In these people, further laboratory and clinical evaluation is warranted, as they may have another cause for their symptoms. [14] Furthermore, reviewing their medications and possible dietary supplements is important, as several medications can affect thyroid hormone levels. [14]
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.
This in turn causes the thyroid to produce T3 and T4, which play a role in the aforementioned processes. ... many people were being prescribed drugs that might not help them, and they may even ...
The most common drugs in this class are thioamides, which include propylthiouracil, methimazole and its prodrug carbimazole. Additionally, propylthiouracil may reduce the de-iodination of thyroxine (T 4) into triiodothyronine (T 3) in peripheral tissues. [2] Lugol's iodine is used to temporarily block thyroid hormone synthesis before surgeries. [3]
This can cause hypothyroidism by reducing the thyrotropic effects of TSH. They are found in Hashimoto's thyroiditis and Graves' disease and may be cause of fluctuation of thyroid function in the latter. During treatment of Graves' disease they may also become the predominant antibody, which can cause hypothyroidism. [2] [13]
Liothyronine may be used when there is an impaired conversion of T 4 to T 3 in peripheral tissues. [2] The dose of liothyronine for hypothyroidism is a lower amount than levothyroxine due it being a higher concentrated synthetic medication. [2]
[4] [5] [7] In the hypothyroid phase, patient may experience cold intolerance, fatigue, weight gain, or depression. The hypothyroidism may or may not resolve spontaneously. [5] Those who develop drug-induced thyroiditis may have clinical course similar to subacute lymphocytic thyroiditis or other forms of thyroiditis. [5]
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