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Data updated: Mar 10, 2026

UNITHROID

LEVOTHYROXINE SODIUM
Oncology Approved 2000-08-21
3
Indications
--
Phase 3 Trials
25
Years on Market

Details

Status
Prescription
First Approved
2000-08-21
Routes
ORAL
Dosage Forms
TABLET

Companies

Active Ingredient: LEVOTHYROXINE SODIUM

UNITHROID Approval History

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What UNITHROID Treats

2 indications

UNITHROID is approved for 2 conditions since its original approval in 2000. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Hypothyroidism
  • Thyroid Cancer
Source: FDA Label

UNITHROID Boxed Warning

NOT FOR TREATMENT OF OBESITY OR FOR WEIGHT LOSS Thyroid hormones, including UNITHROID, either alone or with other therapeutic agents, should not be used for the treatment of obesity or for weight loss. In euthyroid patients, doses within the range of daily hormonal requirements are ineffective for weight reduction. Larger doses may produce serious or even life threatening manifestations of toxicity, particularly when given in association with sympathomimetic amines such as those used for their a...

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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

UNITHROID FDA Label Details

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Indications & Usage

FDA Label (PDF)

Hypothyroidism UNITHROID is indicated in pediatric and adult patients as a replacement therapy in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism. Pituitary Thyrotropin (Thyroid-Stimulating Hormone, TSH) Suppression UNITHROID is indicated in pediatric and adult patients as an adjunct to surgery and radioiodine therapy in the management of thyrotropin-dependent well-differentiated thyroid cancer. Limitations of Use: UNITHROID is not indicated for suppression of benign thyroid nodules and nontoxic diffuse goiter in iodine-sufficient p...

⚠️ BOXED WARNING

WARNING: NOT FOR TREATMENT OF OBESITY OR FOR WEIGHT LOSS Thyroid hormones, including UNITHROID, either alone or with other therapeutic agents, should not be used for the treatment of obesity or for weight loss. In euthyroid patients, doses within the range of daily hormonal requirements are ineffect...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.