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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]
Previously, the authors had shown that the use of levothyroxine in people with higher thyroid hormone levels had a negative effect on leg mass in older adults, in a study whose results appeared in ...
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]
Thyroid hormones act on nearly every cell in the body. They act to increase the basal metabolic rate, affect protein synthesis, help regulate long bone growth (synergy with growth hormone) and neural maturation, and increase the body's sensitivity to catecholamines (such as adrenaline) by permissiveness. [12]
Adding liothyronine to levothyroxine has been suggested as a measure to provide better symptom control, but this has not been confirmed by studies. [9] [16] [66] In 2007, the British Thyroid Association stated that combined T 4 and T 3 therapy carried a higher rate of side effects and no benefit over T 4 alone.
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]
Other side effects include granulocytopenia (dose dependent, which improves on cessation of the drug) and aplastic anemia, and in case of propylthiouracil, severe, fulminant liver failure. [20] Patients on these medications should see a doctor if they develop sore throat or fever. The most common side effects are rash and peripheral neuritis. [21]
Some minimal effect on thyroid hormone production however also comes with propranolol—which has two roles in the treatment of hyperthyroidism, determined by the different isomers of propranolol. L-propranolol causes beta-blockade, thus treating the symptoms associated with hyperthyroidism such as tremor, palpitations, anxiety, and heat ...
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