Levothyroxine sodium 0.0125 mg / liothyronine sodium 0.0031 mg [Thyrolar]
RxNorm 903285

Concept Hierarchy & Relationship Mapping

RxNorm Concept Unique Identifier (RxCUI) 903285 represents a standardized clinical drug concept used for cross-system interoperability. This concept aggregates multiple Atom IDs (AUIs), which are specific naming variations and synonyms used across pharmaceutical databases to ensure accurate medication mapping for: levothyroxine sodium 0.0125 mg / liothyronine sodium 0.0031 mg [Thyrolar].

The following semantic concepts and normalized strings are associated with this clinical entity:

SBDC
Levothyroxine sodium 0.0125 mg / liothyronine sodium 0.0031 mg [Thyrolar]
AUI:12303128
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This clinical crossover tool is designed for healthcare professionals, pharmacists, and data analysts to safely compare substitute products and manage medication interoperability.

SBDC

Semantic Branded Drug Component (SBDC):
Levothyroxine sodium 0.0125 mg / liothyronine sodium 0.0031 mg [Thyrolar]
(Atom ID: 12303128)

Clinical Status & Identity

Prescribable Status
NO (Reference)
Part of the RxNorm Current Prescribable Content subset including all drugs available for prescription in the USA.
Concept Description
levothyroxine sodium 0.0125 MG / liothyronine sodium 0.0031 MG [Thyrolar]
Official description of the drug concept as defined in the source vocabulary.
Suppress Flag
O
N: Not suppressible | O: Obsolete | Y: Suppressed by editor | E: Unquantified non-prescribable drug.

Interoperability & Coding

Concept ID (RxCUI)
903285
RxNorm Unique Identifier for the standardized concept.
Atom ID (RXAUI)
12303128
Unique identifier for this specific name variation (Atom).
Term Type (TTY)
SBDC
Semantic Branded Drug Component (Ingredient + Strength + Brand Name)
Source Code
903285
The "Most useful" identifier asserted by the original source vocabulary.

Source & Registry Data

Source Name
RxNorm Vocabulary (RXNORM)
The official name and abbreviation for the vocabulary source.
Source Version
20AA_260601F
The specific version of the vocabulary provided by the source.
Update Date
June 01, 2026
The date when this RxNorm data was last updated by the NLM.
License Contact
RxNorm Customer Service, , U.S. National Library of Medicine, 8600 Rockville Pike, , Bethesda, MD, United States, 20894, (888) FIND-NLM, , https://support.nlm.nih.gov/support/create-case/, https://www.nlm.nih.gov/research/umls/rxnorm/
Source licensing contact information.

Technical Attributes & Logic

RXN OBSOLETED
04/28/2026
Date the RxNorm atom became obsolete

Patient Education

Liotrix


Liotrix is used to treat hypothyroidism (a condition that results when the thyroid gland does not produce enough thyroid hormone). Symptoms of hypothyroidism include lack of energy, depression, constipation, weight gain, hair loss, dry skin, dry coarse hair, muscle cramps, decreased concentration, aches and pains, swelling of the legs, and increased sensitivity to cold. When taken correctly, liotrix can reverse these symptoms. Liotrix is also used to treat goiter (enlarged thyroid gland). This medication is also used to test for hyperthyroidism (a condition where the thyroid gland produces too much thyroid hormone). Liotrix is in a class of medications called thyroid agents. It works by supplying the thyroid hormones normally produced by the body.
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