Liothyronine

DB00279ApprovedInvestigationalVet approvedSmall moleculel-Triiodothyronine

Liothyronine is a thyroid hormone replacement therapy used to treat hypothyroidism, to suppress TSH, and to help in the diagnosis of hyperthyroidism. Liothyronine is a thyroidal hormone T3 which is normally produced by the thyroid gland in a ratio 4:1 when compared with T4: T3.

Chemical structure of Liothyronine
Mechanism
Curator reviewed · 1 reference
Primary indication
Liothyronine is officially approved for the following indications: Replacement therapy in primary (thyroidal), secondary (pituitary) and tertiary (hypothalamic) congenital or acquired hypothyroidism.Curator reviewed · 9 structured indications
Formula / weight
C15H12I3NO4 · 650.9735 g/mol (avg)
First approval
Canada, 2011 · United States, 1956
Also known as
L-T3 · LT3 · Triiodothyronine
Code names
NSC-80203
Brand names
  • Cytomel
  • Liomny
  • Np Thyroid

Resolves to

Structure
InChIKeyAUYYCJSJGJYCDS-LBPRGKRZSA-NSMILESN[C@@H](CC1=CC(I)=C(OC2=CC(I)=C(O)C=C2)C(I)=C1)C(O)=O

What you can answer from here — as of September 23, 2026

3Protein targetsEach mapped to UniProt, with action and pharmacological action
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11TransportersSubstrate / inhibitor direction, not just membership
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1,309Drug interactionsStructured to mechanism, not free text
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53Clinical trialsPhase, status and sponsor resolved per trial
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9Structured indicationsCondition, population, route and combination as fields, not prose
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2ContraindicationsEach with its own population and attribute set
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220Marketed productsAcross 5 countries and 59 labellers
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2ATC codesIncluding every combination product, plus 15 drug categories
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46+ReferencesStructured and connected to the statements they support
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Which drugs share a target with Liothyronine, and which of those have an active Phase 3 trial?

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