levothyroxine

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Related to Levothroid: Levothyroxine, Synthroid

levothyroxine

 [le″vo-thi-rok´sin]
l-thyroxine, obtained from the thyroid gland of domesticated food animals or prepared synthetically; used for replacement therapy in hypothyroidism and for the prophylaxis and treatment of goiter and of thyroid cancer; administered orally, intravenously, or intramuscularly as the sodium salt.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

levothyroxine

(lē′və-thī-rŏk′sēn′, -sĭn)
n.
An isomer of thyroxine, C15H10I4NO4, used in the form of its sodium salt to treat thyroxine deficiency.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

levothyroxine

Thyroid hormone as a sodium salt used to treat hypothyroidism. The drug is on the WHO official list. A brand name is Thyronine.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
* One of the synthetic [T.sub.4] drugs (brand names Synthroid, Levoxyl, Levothroid, and Unithroid; generic name levothyroxine);
It also discusses management of hypothyroidism and use of thyroid hormone replacement therapy, particularly levothyroxine (synthetic T4) (Levo-T, Levolet, Levothroid, Levoxyl, Novothyrox, Synthroid, Unithroid, and generics) and briefly addresses hyperthyroidism resulting from overtreatment of hypothyroidism.
Abbott Laboratories and Forest Pharmaceuticals, manufacturer of Levothroid, filed New Drug Applications in August but had not received approval at press time.
Doctors complain about thyroid test results that don't seem to agree, thyroid test results that don't support their clinical impression, and a TSH that's too high in patients taking the usual dosage of levothyroxine (Levothroid, Levoxine, Synthroid).
Generic preparations of L-thyroxine may not be bioequivalent to brand products.[17] Several brand-name products are available; among them, Levothroid and Synthroid, were shown to be therapeutically interchangeable.[3]
When dealing with hypothyroidism, for example, naturopaths often measure T3 and T4 levels in addition to ordering the thyroid stimulating hormone (TSH) test, and they recommend T3-T4 preparations, such as desiccated thyroid, instead of standardized Levothroid T4 supplementation.
Pittsburgh-based Mylan is also marketing generic Levothroid (levothyroxine sodium), a thyroid activity treatment equivalent to Forest Laboratories Inc.'s brand product.
Food and Drug Administration (FDA): Unithroid, Levoxyl, Synthroid, Levothroid, Levolet, Levo-T, and Novothyrox (only the first four are currently being marketed in the US).
Drug Dosage Cost/Day levothyroxine 1.6 [micro]g/kg $0.18 * (Levothroid, (on average) (Levothroid); Levoxyl, $0.21* Synthroid, (Levoxyl); Unithroid) $0.36 * Synthroid, $0.37 ** (Unithiroid) (for a 70-kg patient) liothyronine 25 [micro]g b.i.d.
Drug Dosage Cost/Day levothyroxine 1.6 [micro]/kg (on $0.18 * (Levothroid, average) (Levothroid); Levoxyl, $0.21 * Synthroid, (Levoxyl); Unithroid) $0.36 * (Synthroid); $0.37 ** (Unithroid) (for a 70-kg patient) liothyronine 25 [micro] b.i.d.
There are three branded oral T4 products available in the United States: levothyroxine sodium (Levoxyl, Synthroid and Levothroid).
(1) In addition to manufacturing Armour Thyroid, Forest makes Levothroid, a proprietary brand of levothyroxine (synthetic thyroxine, or T4).