Hormone
thyroxine Audio
thy·rox·ine [ thahy-rok-seen, -sin ]
Brand Names:
Euthyrox; Levo-T; Levoxyl; Synthroid; Thyquidity; ThyroKare; Thyrolar; Thyro-Tabs; Tirosint; Unithroid
Effect:
Cellular Synthetic Activity Alteration; Increased Gluconeogenesis; Increased Metabolic Rate
May Prevent:
Hypothyroidism
May Treat:
Goiter; Myxedema; Thyroid Neoplasms; Thyroiditis, Autoimmune; Thyrotoxicosis
More Information:
ChemID; DrugBank; DailyMed; PDR
Definitions related to levothyroxine:
  • (thyroxine) A hormone synthesized and secreted by the thyroid gland containing four iodine atoms and is converted to triiodothyronine (T3) in the body, influencing metabolism and organ function.
    NCI
    U.S. National Cancer Institute, 2021
  • (thyroxine) A hormone that is made by the thyroid gland and contains iodine. T4 increases the rate of chemical reactions in cells and helps control growth and development. T4 can also be made in the laboratory and is used to treat thyroid disorders.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • (thyroxine) One of two types of major thyroid hormone manufactured by the thyroid gland. It contains four iodine atoms. Also known as T4.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • (thyroxine) Tetraiodothyronine (T4); major hormone elaborated by the thyroid gland follicular cells; increases the rate of cell metabolism, essential for central nervous system maturation, and regulates a number of other functions.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • (thyroxine) The major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines (MONOIODOTYROSINE) and the coupling of iodotyrosines (DIIODOTYROSINE) in the THYROGLOBULIN. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form TRIIODOTHYRONINE which exerts a broad spectrum of stimulatory effects on cell metabolism.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
Try this search on: Farlex, Merriam-Webster, Oxford Dictionary, or Wordnik

This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.