quinidine sulfate

Drug ingredient

CAS 50-54-4

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

US productionNot reported

Import value, 2024$5M

Top sourceChina 33%

EPA lists this chemical as inactive, meaning no company reported making, importing or processing it in the US from 2006 to 2016.

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 293920 · basket

These shares come from HS customs code 293920, which covers 9 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 33%ChinaDE 32%GermanyID 18%IndonesiaIN 8%IndiaNL 8%Netherlands

Hungary

8 FDA-registered drug labelers

Avanir Pharmaceuticals, Inc.

Buchler GmbH

Camber Pharmaceuticals, Inc.

EPIC PHARMA, LLC

Otsuka America Pharmaceutical, Inc

Patheon Inc.

Professional Compounding Centers of America dba PCCA

Spectrum Laboratory Products, Inc.

Why It Matters

Sectors

Health

Downstream Uses

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

•Nuedexta
•Quinidine Sulfate
•Dextromethorphan hydrobromide and quinidine sulfate

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

CAS50-54-4

PubChem CID441326

DTXSIDDTXSID50883224

FormulaC40H50N4O8S

Mol. Weight746.9 g/mol

SMILESCOC1=CC2=C(C=CN=C2C=C1)C(C3CC4CCN3CC4C=C)O.COC1=CC2=C(C=CN=C2C=C1)C(C3CC4CCN3CC4C=C)O.OS(=O)(=O)O

Data Sources

PubChem · compound 441326Retrieved 2026-04-07
EPA TSCA InventoryRetrieved 2026-04-24
FDA National Drug Code directoryRetrieved 2026-04-07
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

quinidine sulfate (CAS 50-54-4) https://chemicalindependence.com/chemical/50-54-4/ PubChem: 441326. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/441326 EPA TSCA Inventory: CAS 50-54-4. Retrieved 2026-04-24. https://www.epa.gov/tsca-inventory FDA National Drug Code directory: bulk match. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 293920 for CAS 50-54-4. Reporting year: 2024. https://usatrade.census.gov/