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Restrict the search for
levothyroxine
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There is one exact (name or code) match for levothyroxine
Status:
US Approved Rx
(2016)
Source:
ANDA206163
(2016)
Source URL:
First approved in 1953
Class (Stereo):
CHEMICAL (ABSOLUTE)
Conditions:
Levothyroxine (T4) is a synthetically prepared levo isomer of thyroxine, the major hormone secreted from the thyroid gland. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form triiodothyronine (T3) which exerts a broad spectrum of stimulatory effects on cell metabolism. Thyroid hormone increases the metabolic rate of cells of all tissues in the body. In the fetus and newborn, thyroid hormone is important for the growth and development of all tissues including bones and the brain. In adults, thyroid hormone helps to maintain brain function, food metabolism, and body temperature, among other effects. The symptoms of thyroid deficiency relieved by levothyroxine include slow speech, lack of energy, weight gain, hair loss, dry thick skin and unusual sensitivity to cold. Levothyroxine acts like the endogenous thyroid hormone thyroxine (T4, a tetra-iodinated tyrosine derivative). In the liver and kidney, T4 is converted to T3, the active metabolite. In order to increase solubility, the thyroid hormones attach to thyroid hormone binding proteins, thyroxin-binding globulin, and thyroxin-binding prealbumin (transthyretin). Transport and binding to thyroid hormone receptors in the cytoplasm and nucleus then takes place. Thus by acting as a replacement for natural thyroxine, symptoms of thyroxine deficiency are relieved. Levothyroxine is used for use alone or in combination with antithyroid agents to treat hypothyroidism, goiter, chronic lymphocytic thyroiditis, myxedema coma, and stupor.
Status:
US Approved Rx
(2016)
Source:
ANDA206163
(2016)
Source URL:
First approved in 1953
Class (Stereo):
CHEMICAL (ABSOLUTE)
Conditions:
Levothyroxine (T4) is a synthetically prepared levo isomer of thyroxine, the major hormone secreted from the thyroid gland. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form triiodothyronine (T3) which exerts a broad spectrum of stimulatory effects on cell metabolism. Thyroid hormone increases the metabolic rate of cells of all tissues in the body. In the fetus and newborn, thyroid hormone is important for the growth and development of all tissues including bones and the brain. In adults, thyroid hormone helps to maintain brain function, food metabolism, and body temperature, among other effects. The symptoms of thyroid deficiency relieved by levothyroxine include slow speech, lack of energy, weight gain, hair loss, dry thick skin and unusual sensitivity to cold. Levothyroxine acts like the endogenous thyroid hormone thyroxine (T4, a tetra-iodinated tyrosine derivative). In the liver and kidney, T4 is converted to T3, the active metabolite. In order to increase solubility, the thyroid hormones attach to thyroid hormone binding proteins, thyroxin-binding globulin, and thyroxin-binding prealbumin (transthyretin). Transport and binding to thyroid hormone receptors in the cytoplasm and nucleus then takes place. Thus by acting as a replacement for natural thyroxine, symptoms of thyroxine deficiency are relieved. Levothyroxine is used for use alone or in combination with antithyroid agents to treat hypothyroidism, goiter, chronic lymphocytic thyroiditis, myxedema coma, and stupor.
Status:
US Approved Rx
(2012)
Source:
ANDA200295
(2012)
Source URL:
First approved in 1956
Source:
NDA010379
Source URL:
Class (Stereo):
CHEMICAL (ABSOLUTE)
Targets:
Liothyronine (CYTOMEL®) is a T3 thyroid hormone normally synthesized and secreted by the thyroid gland in much smaller quantities than its prohormone thyroxine (T4). Most T3 is derived from peripheral monodeiodination of T4 at the 5' position of the outer ring of the iodothyronine nucleus. The hormone finally delivered and used by the tissues is mainly T3. The mechanisms by which thyroid hormones exert their physiologic action are not well understood. These hormones enhance oxygen consumption by most tissues of the body, increase the basal metabolic rate and the metabolism of carbohydrates, lipids, and proteins. Thus, they exert a profound influence on every organ system in the body and are of particular importance in the development of the central nervous system. Thyroid hormone drugs are indicated: as the replacement or supplemental therapy in patients with hypothyroidism of any etiology; as pituitary thyroid-stimulating hormone (TSH) suppressants, in the treatment or prevention of various types of euthyroid goiters; as diagnostic agents in suppression tests to differentiate suspected mild hyperthyroidism or thyroid gland autonomy.
Status:
Investigational
Source:
USAN:THYROXINE I 131 [USAN]
Source URL:
Class (Stereo):
CHEMICAL (ABSOLUTE)
Thyroxine I-131 is a radiolabeled thyroid hormone that has been studied as a diagnostic agent for thyroid cancer. In pharmacokinetic studies, Thyroxine I-131 shows broad tissue distribution and 99% of the ingested radiolabeled Thyroxine may be found in the skin, intestines, muscles, blood, bones, liver, and thyroid glands of rats.
Status:
Investigational
Source:
USAN:THYROXINE I 125 [USAN]
Source URL:
Class (Stereo):
CHEMICAL (ABSOLUTE)
Thyroxine I-125 is a radiolabeled thyroid hormone that has been used for diagnostics of thyroid disease. Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. Thyroxine plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. A thyroxine test measures the level of Thyroxine in the plasma and Thyroxine I-125 was used as a radioiodine-labeled tracer for this assay. Currently Thyroxine I-125 primary use as a tracer for binding assays and other radiometric biological studies.
Status:
Designated
Source:
FDA ORPHAN DRUG:133100
Source URL:
Class (Stereo):
CHEMICAL (ACHIRAL)
Targets:
Conditions:
3,3',5,5'-Tetraiodothyroacetic acid (Tetrac) is a deaminated analog of L-thyroxine (T4) that blocks the proangiogenesis actions of T4 and 3, 5, 3’-triiodo-L-thyronine as well as other growth factors at the cell surface receptor for thyroid hormone on integrin αvβ3. 3,3',5,5'-Tetraiodothyroacetic acid blocks the transcriptional activities directed by L-thyroxine (T4) and 3,5,3’-triiodo-L-thyronine (T3) at αvβ3, but, independently of T4 and T3, 3,3',5,5'-Tetraiodothyroacetic acid modulates transcription of cancer cell genes that are important to cell survival pathways, control of the cell cycle, angiogenesis (VEGFA, FGF), apoptosis, cell export of chemotherapeutic agents, and repair of double-strand DNA breaks. 3,3',5,5'-Tetraiodothyroacetic acid was found to perturb the angiogenesis process stimulated by VEGF (Vascular Endothelial Growth Factor) or FGF (Fibroblast Growth Factor) without influencing the preexisting blood vessels.
Status:
Other
Class (Stereo):
CHEMICAL (ABSOLUTE)
Targets:
Conditions:
3,5-Diiodo-L-thyronine (3,5-T2), a potential metabolite of 3,3',5-triiodothyronine (T3), is an active thyroid hormone. It acts as an alternative ligand for thyroid hormone receptor beta. 3,5-Diiodo-L-thyronine has the capacity to stimulate hepatic lipid catabolism but acts by different from T3 molecular mechanisms to achieve this effect.
3,3',5'-Triiodo-L-thyronine (also known as Reverse T3 (rT3)) is an inactive mirror-image of the active hormone T3. It is formed from T4 hormone and binds to T3 receptors, thus blocking the action of T3. The ratio of rT3 to T3 is a valuable biomarker of the metabolism and function of thyroid hormones. An elevated ratio of rT3 over T3 is a sign of “sick euthyroid” syndrome and helps to exclude a diagnosis of hypothyroidism, particularly in critically ill patients. The rT3 test is performed by ELISA method.
