Zafirlukast

Drug ingredient

CAS 107753-78-6

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

US productionNot reported

Import value, 2024$2.0B

Top sourceIreland 63%

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 293590 · basket

These shares come from HS customs code 293590, which covers 182 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).

IE 63%IrelandSG 14%SingaporeIN 7%IndiaCN 7%ChinaCH 2%Switzerland

Portugal
Spain
Italy
Austria
Israel
Hungary
Canada
South Korea
Netherlands
Finland
Poland
Indonesia
Ukraine
Mexico
South Africa
Croatia
Greece
Taiwan
Hong Kong

11 FDA-registered drug labelers

American Health Packaging

Aurobindo Pharma Limited

AvKARE

Bryant Ranch Prepack

Camber Pharmaceuticals, Inc.

Chromo Laboratories India Private Limited

Dr. Reddys Laboratories Limited

Hetero Drugs Limited

MSN Pharmachem Private Limited

Par Active Technologies Private Limited

Strides Pharma Science Limited

Why It Matters

Sectors

Health

Downstream Uses

Appears in 1 drug and cosmetic product listings (FDA).

•Zafirlukast

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

$660.00/gAstaTech (2 weeks)

CountryUnited States

Pack$66.00 / 100 mg

Purity95%

Vendors20 available

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

19 more vendors

Vendor	Country	$/g	Pack	Purity
Molnova	China	$680.00	200 mg	99%
A2B Chem LLC	United States	$720.00	100 mg	99%
MedChemExpress MCE	Sweden	$811.91	1 g	99.89%
AA BLOCKS	United States	$825.00	1 g	99%
TargetMol Chemicals	China → United States	$930.00	100 mg	99.83%
AK Scientific Specialized	United States	$999.00	1 g	95%
Aaron Chemicals LLC	Hong Kong	$1120.00	50 mg	99%
Angene Chemical	China → Hong Kong	$1160.00	50 mg	99%
Apexbio Technology LLC	United States	$1360.00	50 mg	99.28%
AK Scientific, Inc.	United States	$1399.00	1 g	98%
MedKoo Biosciences, Inc	United States	$1400.00	1 g	98%
Ambeed, Inc.	United States	$1500.00	50 mg	99%
Cayman Europe	Estonia	$1607.69	1 g	97%
Angene International Limited	United States	$2181.00	1 g	98%
Combi-Blocks, Inc.	United States	$4000.00	100 mg	98%
Vitas M Chemical Limited	Hong Kong	$9379.89	10 μmol	90%
Sigma-Aldrich (Rush Stock)	Germany	$9630.20	50 mg	98%
Sigma-Aldrich	Germany	$9630.20	50 mg	98%
Princeton BioMolecular Research (SC)	United States	$18000.00	5 mg	90%

Chemical Identity

CAS107753-78-6

PubChem CID5717

DTXSIDDTXSID5023746

FormulaC31H33N3O6S

Mol. Weight575.7 g/mol

SMILESCC1=CC=CC=C1S(=O)(=O)NC(=O)C2=CC(=C(C=C2)CC3=CN(C4=C3C=C(C=C4)NC(=O)OC5CCCC5)C)OC

Data Sources

PubChem · compound 5717Retrieved 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

Zafirlukast (CAS 107753-78-6) https://chemicalindependence.com/chemical/107753-78-6/ PubChem: 5717. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/5717 FDA National Drug Code directory: CAS 107753-78-6. 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 293590 for CAS 107753-78-6. Reporting year: 2024. https://usatrade.census.gov/