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Topiramate

Drug ingredient

CAS 97240-79-4

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

Molecular structure of 97240-79-4
US productionNot reported
Import value, 2024$3.5B
Top sourceIreland 57%

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 293299 · basket

These shares come from HS customs code 293299, which covers 229 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IE 57%IrelandNL 24%NetherlandsCH 8%SwitzerlandCN 5%ChinaIT 2%Italy
71 FDA-registered drug labelers
A-S Medication Solutions
Advagen Pharma Ltd
Advanced Rx of Tennessee, LLC
Advanced Rx Pharmacy of Tennessee, LLC
Ajanta Pharma USA Inc.
Alivus Life Sciences Limited
American Health Packaging
Aphena Pharma Solutions - Tennessee, LLC
Ascend Laboratories, LLC
Asclemed USA, Inc.
Aurobindo Pharma Limited
AvKARE
AX Pharmaceutical Corp
Azurity Pharmaceuticals, Inc.
Bryant Ranch Prepack
C
Camber Pharmaceuticals, Inc.
Cardinal Health 107, LLC
Catalent Pharma Solutions LLC
Cipla Ltd.
Cipla USA Inc.
DARMERICA, LLC
Dr. Reddys Laboratories Inc.
Dr.Reddy's laboratories Limited
Endo USA, Inc.
EXELAN PHARMACEUTICALS INC.
Glenmark Pharmaceuticals Inc., USA
Global Calcium Private Limited
Golden State Medical Supply, Inc.
Heritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc.
Hetero Drugs Limited
Janssen Pharmaceutical Sciences Unlimited Company
Janssen Pharmaceuticals, Inc.
LETCO MEDICAL, LLC
Lupin Pharmaceuticals, Inc.
Major Pharmaceuticals
Medisca Inc.
MSN Organics Private Limited
NCS HealthCare of KY, LLC dba Vangard Labs
NorthStar RxLLC
Northwind Health Company, LLC
NuCare Pharmaceuticals, Inc.
PD-Rx Pharmaceuticals, Inc.
Pharmaceutical Works POLPHARMA
Prasco Laboratories
Preferred Pharmaceuticals Inc.
Professional Compounding Centers of America
Proficient Rx LP
Quality Care Products, LLC
Quallent Pharmaceuticals Health LLC
REMEDYREPACK INC.
SciAnda(Changshu) Pharmaceuticals, Ltd.
ScinoPharm Taiwan Ltd.
Siegfried AG
Spectrum Laboratory Products, Inc.
Spica Laboratories Private Limited
ST. MARY'S MEDICAL PARK PHARMACY
SUN PHARMACEUTICAL INDUSTRIES, INC.
Supernus Pharmaceuticals, Inc.
Teva Pharmaceuticals, Inc.
Unichem Laboratories Limited, India
Unichem Pharmaceuticals (USA), Inc.
Upsher-Smith Laboratories, LLC
Vitruvias Therapeutics, Inc.
Vivus LLC
Willow Birch Pharma, Inc.
Willow Birch Pharma, LLC
XLCare Pharmaceuticals, Inc.
ZHEJIANG HUAHAI PHARMACEUTICAL CO., LTD.
Zydus Lifesciences Limited
Zydus Pharmaceuticals USA Inc.

Why It Matters

Sectors
Health
Downstream Uses

Appears in 8 drug and cosmetic product listings (FDA).

  • •Topiramate
  • •Topamax
  • •Trokendi XR
  • •Qudexy XR
  • •Eprontia
  • •Phentermine and Topiramate Extended-Release
  • •Qsymia
  • •phentermine and topiramate
FDA Shortage Status
No Shortage

Chemical Identity

CAS97240-79-4
PubChem CID5284627
DTXSIDDTXSID8023688
FormulaC12H21NO8S
Mol. Weight339.36 g/mol
SMILESCC1(OC2COC3(C(C2O1)OC(O3)(C)C)COS(=O)(=O)N)C

Data Sources

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Brief citations

Topiramate (CAS 97240-79-4) https://chemicalindependence.com/chemical/97240-79-4/ PubChem: 5284627. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/5284627 FDA National Drug Code directory: CAS 97240-79-4. Retrieved 2026-04-25. https://open.fda.gov/data/ndc/ FDA Drug Shortages: CAS 97240-79-4. Retrieved 2026-06-13. https://www.accessdata.fda.gov/scripts/drugshortages/ US Census international trade: HS 293299 for CAS 97240-79-4. Reporting year: 2024. https://usatrade.census.gov/