Levothyroxine, also known as L-thyroxine, is a synthetic form of the thyroid hormone thyroxine (T4). It is used to treat thyroid hormone deficiency (hypothyroidism), including a severe form known as myxedema coma. It may also be used to treat and prevent certain types of thyroid tumors. It is not indicated for weight loss. Levothyroxine is taken orally (by mouth) or given by intravenous injection. Levothyroxine has a half-life of 7.5 days when taken daily, so about six weeks is required for it to reach a steady level in the blood.
Side effects from excessive doses include weight loss, trouble tolerating heat, sweating, anxiety, trouble sleeping, tremor, and fast heart rate. Use is not recommended in people who have had a recent heart attack. Use during pregnancy has been found to be safe. Dosing should be based on regular measurements of thyroid-stimulating hormone (TSH) and T4 levels in the blood. Much of the effect of levothyroxine is following its conversion to triiodothyronine (T3).
Levothyroxine was first made in 1927. It is on the World Health Organization's List of Essential Medicines. Levothyroxine is available as a generic medication. In 2022, it was the fourth most commonly prescribed medication in the United States, with more than 82 million prescriptions.
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Mus musculus
(NCBI:txid10090)
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Source: BioModels - MODEL1507180067
See:
PubMed
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Bronsted base
A molecular entity capable of accepting a hydron from a donor (Bronsted acid).
(via organic amino compound )
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adrenergic agonist
An agent that selectively binds to and activates adrenergic receptors.
mouse metabolite
Any mammalian metabolite produced during a metabolic reaction in a mouse (Mus musculus).
alpha-adrenergic agonist
An agent that selectively binds to and activates alpha-adrenergic receptors.
beta-adrenergic agonist
An agent that selectively binds to and activates beta-adrenergic receptors.
sympathomimetic agent
A drug that mimics the effects of stimulating postganglionic adrenergic sympathetic nerves. Included in this class are drugs that directly stimulate adrenergic receptors and drugs that act indirectly by provoking the release of adrenergic transmitters.
hormone
Originally referring to an endogenous compound that is formed in specialized organ or group of cells and carried to another organ or group of cells, in the same organism, upon which it has a specific regulatory function, the term is now commonly used to include non-endogenous, semi-synthetic and fully synthetic analogues of such compounds.
molecular messenger
(via monoamine molecular messenger )
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adrenergic agonist
An agent that selectively binds to and activates adrenergic receptors.
vasodilator agent
A drug used to cause dilation of the blood vessels.
mydriatic agent
Agent that dilates the pupil. Used in eye diseases and to facilitate eye examination. It may be either a sympathomimetic or parasympatholytic. The latter cause cycloplegia or paralysis of accommodation at high doses and may precipitate glaucoma.
bronchodilator agent
An agent that causes an increase in the expansion of a bronchus or bronchial tubes.
alpha-adrenergic agonist
An agent that selectively binds to and activates alpha-adrenergic receptors.
vasoconstrictor agent
Drug used to cause constriction of the blood vessels.
beta-adrenergic agonist
An agent that selectively binds to and activates beta-adrenergic receptors.
sympathomimetic agent
A drug that mimics the effects of stimulating postganglionic adrenergic sympathetic nerves. Included in this class are drugs that directly stimulate adrenergic receptors and drugs that act indirectly by provoking the release of adrenergic transmitters.
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View more via ChEBI Ontology
4-[(1R)-1-hydroxy-2-(methylamino)ethyl]benzene-1,2-diol
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epinefrina
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ChemIDplus
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epinephrine
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ChemIDplus
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épinéphrine
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epinephrinum
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(−)-(R)-epinephrine
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NIST Chemistry WebBook
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IUPHAR
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ChEBI
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KEGG COMPOUND
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(R)-(-)-Epirenamine
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4-[(1R)-1-Hydroxy-2-(methylamino)ethyl]-1,2-benzenediol
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4-[(1R)-1-Hydroxy-2-(methylamino)ethyl]-1,2-benzenediol
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KEGG COMPOUND
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Adrenalin
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adrénaline
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adrenaline
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Primatene
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2368277
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Reaxys Registry Number
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51-43-4
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CAS Registry Number
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KEGG COMPOUND
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51-43-4
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CAS Registry Number
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ChemIDplus
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51-43-4
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CAS Registry Number
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NIST Chemistry WebBook
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18325983
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