letrozole
Drug ingredientThis chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.
Where It Comes From
27 FDA-registered drug labelers
A-S Medication Solutions
Accord Healthcare, Inc.
ATLANTIC BIOLOGICALS CORP.
Aurobindo Pharma Limited
Avet Pharmaceuticals Inc.
AvKARE
AvPAK
Breckenridge Pharmaceutical, Inc.
Bryant Ranch Prepack
Catalent Micron Technologies, Inc.
Chartwell RX, LLC
Dr. Reddy's Laboratories Limited
Golden State Medical Supply, Inc.
Hetero Labs Limited
Jiangsu Hengrui Pharmaceuticals Co., Ltd.
Natco Pharma Limited
Novartis Pharma Stein AG
Novartis Pharmaceuticals Corporation
NuCare Pharmaceuticals,Inc.
Proficient Rx LP
ScinoPharm Taiwan Ltd.
Sicor de Mexico S.A. de C.V
SUN PHARMACEUTICAL INDUSTRIES, INC.
Synthimed Labs Private Limited
Teva Pharmaceuticals USA, Inc.
Upsher-Smith Laboratories, LLC
Yiling Pharmaceutical, Inc.
Why It Matters
Sectors
Health
Downstream Uses
Appears in 2 drug and cosmetic product listings (FDA).
- •Letrozole
- •Femara
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
CAS112809-51-5
PubChem CID3902
DTXSIDDTXSID4023202
FormulaC17H11N5
Mol. Weight285.3 g/mol
SMILESC1=CC(=CC=C1C#N)C(C2=CC=C(C=C2)C#N)N3C=NC=N3
Data Sources
39022026-04-07
https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/letrozole/cids/JSON
Archive: data/sources/pubchem_name/letrozole.json
CAS 112809-51-52026-04-25
https://open.fda.gov/data/ndc/
Archive: data/sources/fda/ndc/ndc.json
bulk match2026-04-07
https://open.fda.gov/data/ndc/
Archive: data/sources/fda/ndc/ndc.json