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Thyroxine, also known as T 4, is a hormone produced by the thyroid gland. It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T 3 ). [ 1 ]
Levothyroxine, also known as L-thyroxine, is a synthetic form of the thyroid hormone thyroxine (T 4). [ 5 ] [ 8 ] It is used to treat thyroid hormone deficiency (hypothyroidism), including a severe form known as myxedema coma . [ 5 ]
The syndrome can present with variable symptoms, even between members of the same family harboring the same mutation. [1] Typically most or all tissues are resistant to thyroid hormone, so despite raised measures of serum thyroid hormone the individual may appear euthyroid (have no symptoms of over- or underactivity of the thyroid gland).
Thyroid hormone replacement with levothyroxine treats hypothyroidism. [3] Medical professionals adjust the dose according to symptoms and normalization of the thyroxine and TSH levels. [3] Thyroid medication is safe in pregnancy. [3] Although an adequate amount of dietary iodine is important, too much may worsen specific forms of hypothyroidism ...
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.
Treatment consists of a daily dose of thyroxine, available as a small tablet. The generic name is levothyroxine, and several brands are available. The tablet is crushed and given to the baby with a small amount of water or milk. The most commonly recommended dose range is 10-15 μg/kg daily, typically 12.5 to 37.5 or 44 μg. [8]
In 2020, levothyroxine, a manufactured form of thyroxine, was the second most commonly prescribed medication in the United States, with more than 98 million prescriptions. [9] [10] Levothyroxine is on the World Health Organization's List of Essential Medicines. [11]
They contain a mixture of thyroxine (T4) and triiodothyronine (T3). [1] Desiccated thyroid has been used since the late 1800s. [3] It is usually made from pigs, sheep, or cows. [4] It is available as a generic medication. [1] In 2022, it was the 137th most commonly prescribed medication in the United States, with more than 4 million prescriptions.