Estrogens, conjugated
Drug ingredientCAS 12126-59-9
This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.
US productionNot reported
Top sourceNo public record
This chemical is not on EPA’s Toxic Substances Control Act inventory, the list behind EPA’s production survey.
Why supply is unknownWhere It Comes From
EPA and Census publish no US supply data for this chemical.
11 FDA-registered drug labelers
A-S Medication Solutions
Aspen Oss B.V.
Ingenus Pharmaceuticals, LLC
Pfizer Ireland Pharmaceuticals Unlimited Company
Prasco Laboratories
Professional Complementary Health Formulas
Sterling S.p.A.
Symbiotec Pharmalab Limited
U.S. Pharmaceuticals
Wyeth Pharmaceuticals LLC, a subsidiary of Pfizer Inc.
Xinjiang Nuziline Bio-Pharmaceutical Co., Ltd.
Why It Matters
Sectors
Health
Downstream Uses
Appears in 10 drug and cosmetic product listings (FDA).
- •Premarin
- •Conjugated Estrogens
- •Estrogen 1517
- •Premarin Vaginal
- •Duavee
- •estrogens, conjugated
- •Fem Pro Drops 2025
- •Menopause Drops 2044
Show all 10
- •Prempro
- •PMS Drops 2124
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 FDA shortage records
Chemical Identity
CAS12126-59-9
PubChem CID45357473
DTXSIDDTXSID9021186
FormulaC18H21NaO5S
Mol. Weight372.4 g/mol
SMILESCC12CCC3C(C1CCC2=O)CCC4=C3C=CC(=C4)OS(=O)(=O)[O-].[Na+]
Data Sources
- PubChem · compound 45357473Retrieved 2026-04-07
- FDA National Drug Code directoryRetrieved 2026-04-25
- FDA National Drug Code directoryRetrieved 2026-04-07
Brief citations
Estrogens, conjugated (CAS 12126-59-9) https://chemicalindependence.com/chemical/12126-59-9/ PubChem: 45357473. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/45357473 FDA National Drug Code directory: CAS 12126-59-9. 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/