niclosamide

Drug ingredient

CAS 50-65-7

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

US productionNot reported

Import value, 2024$872M

Top sourceSwitzerland 44%

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 292429 · basket

These shares come from HS customs code 292429, which covers 203 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).

CH 44%SwitzerlandCN 19%ChinaIN 12%IndiaJP 9%JapanIE 6%Ireland

Taiwan
United Kingdom
El Salvador
Colombia
Ukraine
Brazil
Guatemala
Belgium
Netherlands
Turkey
Sweden
Greece
Canada
Israel
New Zealand
Latvia
Lithuania
Finland
Slovakia
Australia
Hong Kong
Czech Republic
Armenia
Poland

3 FDA-registered drug labelers

Derivados Quimicos

Derivados Quimicos SAU

Spectrum Laboratory Products, Inc.

Why It Matters

Sectors

Health

Downstream UsesNot recorded

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

Vendor Pricing

$0.32/gA2B Chem LLC

CountryUnited States

Pack$159.00 / 500 g

Purity98%

Vendors19 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

18 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.41	500 g	98%
Combi-Blocks, Inc.	United States	$0.48	500 g	98%
AstaTech, Inc	United States	$0.59	100 g	95%
AK Scientific Specialized	United States	$0.63	100 g	95%
AK Scientific, Inc.	United States	$0.85	100 g	98%
Sigma-Aldrich (Rush Stock)	Germany	$2.02	250 g	—
Sigma-Aldrich	Germany	$2.02	250 g	—
Cayman Europe	Estonia	$2.25	250 g	95%
Apexbio Technology LLC	United States	$8.00	10 g	99.6%
MedChemExpress MCE	Sweden	$11.98	10 g	99.96%
MedKoo Biosciences, Inc	United States	$34.00	25 g	98%
Molnova	China	$70.00	500 mg	99%
TargetMol Chemicals	China → United States	$78.00	500 mg	99.1%
Vitas M Chemical Limited	Hong Kong	$310.00	1 g	90%
CliniSciences GmbH	Switzerland	$1096.50	100 mg	99%
ChemFaces	China	$1500.00	20 mg	98%
Princeton BioMolecular Research (SC)	United States	$2900.00	100 mg	90%
Key Organics Ltd.	United Kingdom	$6900.00	10 mg	97%

Chemical Identity

CAS50-65-7

PubChem CID4477

DTXSIDDTXSID7040362

FormulaC13H8Cl2N2O4

Mol. Weight327.12 g/mol

SMILESC1=CC(=C(C=C1[N+](=O)[O-])Cl)NC(=O)C2=C(C=CC(=C2)Cl)O

Data Sources

PubChem · compound 4477Retrieved 2026-04-07
FDA National Drug Code directoryRetrieved 2026-04-25
FDA National Drug Code directoryRetrieved 2026-04-07
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

niclosamide (CAS 50-65-7) https://chemicalindependence.com/chemical/50-65-7/ PubChem: 4477. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/4477 FDA National Drug Code directory: CAS 50-65-7. 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/ US Census international trade: HS 292429 for CAS 50-65-7. Reporting year: 2024. https://usatrade.census.gov/