levothyroxine
Drug ingredientThis chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.
Where It Comes From
16 FDA-registered drug labelers
A-S Medication Solutions
Acella Pharmaceuticals, LLC
Apex Energetics Inc.
Asclemed USA, Inc.
BioActive Nutritional
Bryant Ranch Prepack
Calvin Scott & Co Inc.
DIRECT RX
Energique, Inc.
Genus Lifesciences
Guna spa
Northwind Health Company, LLC
NuCare Pharmaceuticals,Inc,
Sichuan Xinchuanyi Biotechnology Co., Ltd
The Wellness Center for Research and Education
Trifluent Pharma, LLC
Why It Matters
Sectors
Health
Downstream Uses
Appears in 23 drug and cosmetic product listings (FDA).
- •NP Thyroid 60
- •NP Thyroid
- •EvexiTHROID
- •NP Thyroid 30
- •Thyroid HP
- •GUNA-Lympho
- •GUNA Lympho Detox
- •NP Thyroid 90
Show all 23
- •Thyropar
- •Mitochondria PRO
- •Neurotransmitter Pro
- •NP Thyroid 15
- •RenThyroid
- •NP Thyroid 120
- •Intestine Formula
- •GUNA-Geriatrics
- •Thyro T3 Rescue
- •R20 Testogen
- •R06 Thyroid
- •Thyroid Formula
- •Thyroxine Cord
- •Thyroplex
- •R08 Lymphatics
FDA Shortage Status
Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."
No Shortage
Shortage History
Each row is a separate manufacturer's FDA shortage filing — not a timeline for the drug as a whole. Multiple "current" entries are normal: each manufacturer/NDC files independently. Status reflects the manufacturer's report; reason describes their supply situation (Available, Unavailable, or to be discontinued).
to be discontinued
Levothyroxine Sodium Tablet
07/10/2025Chemical Identity
CAS51-48-9
PubChem CID5819
DTXSIDDTXSID8023214
FormulaC15H11I4NO4
Mol. Weight776.87 g/mol
SMILESC1=C(C=C(C(=C1I)OC2=CC(=C(C(=C2)I)O)I)I)CC(C(=O)O)N
Data Sources
58192026-04-07
https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/levothyroxine/cids/JSON
Archive: data/sources/pubchem_name/levothyroxine.json
CAS 51-48-92026-04-24
https://www.epa.gov/tsca-inventory
Archive: data/sources/tsca/tsca_inventory.csv
CAS 51-48-92026-06-13
https://api.fda.gov/drug/shortages.json
Archive: data/sources/fda/shortages/shortages.json