Flag of the United StatesAmerican Chemical Independence

liothyronine sodium

Drug ingredient

CAS 55-06-1

This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.

Molecular structure of 55-06-1
1 Na⁺
US productionNot reported
Import value, 2024$174M
Top sourceItaly 69%

This chemical is not on EPA’s Toxic Substances Control Act inventory, the list behind EPA’s production survey.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293790 · basket

These shares come from HS customs code 293790, which covers 10 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IT 69%ItalyCN 22%ChinaDE 3%GermanyIN 2%IndiaJP 2%Japan
25 FDA-registered drug labelers
A-S Medication Solutions
ASCLEMED USA INC.
Azico Biophore India Private Limited
Biocon Pharma Inc.
Bryant Ranch Prepack
Dr. Reddy's Labratories Inc.
Golden State Medical Supply, Inc.
LETCO MEDICAL, LLC
Medisca Inc.
Mylan Pharmaceuticals Inc.
Northstar Rx LLC
NuCare Pharmaceuticals,Inc.
PD-Rx Pharmaceuticals, Inc.
Peptido GmbH
Pfizer Laboratories Div Pfizer Inc
Preferred Pharmaceuticals Inc.
Professional Compounding Centers of America
Proficient Rx LP
SIGMAPHARM LABORATORIES, LLC
Sun Pharmaceutical Industries, Inc.
Teva Pharmaceuticals USA, Inc.
VALARY LAB PRIVATE LIMITED
XGen Pharmaceuticals DJB, Inc.
Zydus Lifesciences Limited
Zydus Pharmaceuticals (USA) Inc.

Why It Matters

Sectors
Health
Downstream Uses

Appears in 3 drug and cosmetic product listings (FDA).

  • •Liothyronine sodium
  • •Cytomel
  • •Liomny
FDA Shortage Status
No FDA shortage records

Chemical Identity

CAS55-06-1
PubChem CID23666110
DTXSIDDTXSID8047505
FormulaC15H11I3NNaO4
Mol. Weight672.95 g/mol
SMILESC1=CC(=C(C=C1OC2=C(C=C(C=C2I)CC(C(=O)[O-])N)I)I)O.[Na+]

Data Sources

← Back to Dashboard← Back to Health

Brief citations

liothyronine sodium (CAS 55-06-1) https://chemicalindependence.com/chemical/55-06-1/ PubChem: 23666110. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/23666110 FDA National Drug Code directory: CAS 55-06-1. Retrieved 2026-04-25. https://open.fda.gov/data/ndc/ FDA National Drug Code directory: bulk match. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 293790 for CAS 55-06-1. Reporting year: 2024. https://usatrade.census.gov/