Homatropine hydrobromide

Drug ingredient

CAS 51-56-9

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

US productionNot reported

Import value, 2024$171M

Top sourceSwitzerland 40%

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 293979 · basket

These shares come from HS customs code 293979, which covers 60 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 40%SwitzerlandCN 18%ChinaIT 14%ItalyDE 13%GermanyIN 10%India

Australia
Poland
Belgium
Taiwan
Canada
Japan
Spain
Mexico
New Zealand
Slovenia
Israel

4 FDA-registered drug labelers

Altaire Pharmaceuticals Inc.

C-SQUARED PHARMA LIMITED

C-squared Pharma Sarl

Laurus Labs Limited

Why It Matters

Sectors

Health

Downstream Uses

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

•Homatropine Hydrobromide Ophthalmic

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

$23.80/gAK Scientific Specialized

CountryUnited States

Pack$119.00 / 5 g

Purity95%

Vendors9 available

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

8 more vendors

Vendor	Country	$/g	Pack	Purity
AK Scientific, Inc.	United States	$31.80	5 g	98%
Apexbio Technology LLC	United States	$50.00	1 g	99.64%
Labotest KG	Germany	$453.00	1000 mg	90%
Sigma-Aldrich (Rush Stock)	Germany	$512.90	500 mg	—
Sigma-Aldrich	Germany	$512.90	500 mg	—
Princeton BioMolecular Research (SC)	United States	$2900.00	100 mg	90%
Vitas M Chemical Limited	Hong Kong	$3170.00	100 mg	90%
ChemDiv, Inc.	United States	$6700.00	40 mg	90%

Chemical Identity

CAS51-56-9

PubChem CID6419941

DTXSIDDTXSID5045099

FormulaC16H22BrNO3

Mol. Weight356.25 g/mol

SMILESCN1C2CCC1CC(C2)OC(=O)C(C3=CC=CC=C3)O.Br

Data Sources

PubChem · compound 6419941Retrieved 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

Homatropine hydrobromide (CAS 51-56-9) https://chemicalindependence.com/chemical/51-56-9/ PubChem: 6419941. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/6419941 EPA TSCA Inventory: CAS 51-56-9. 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 293979 for CAS 51-56-9. Reporting year: 2024. https://usatrade.census.gov/