Flag of the United StatesAmerican Chemical Independence

Famciclovir

Drug ingredient

CAS 104227-87-4

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

Molecular structure of 104227-87-4
US productionNot reported
Import value, 2024$7.6B
Top sourceIreland 61%

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 293359 · basket

These shares come from HS customs code 293359, which covers 295 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IE 61%IrelandCH 30%SwitzerlandGB 2%United KingdomCN 2%ChinaIN 1%India
17 FDA-registered drug labelers
Apotex Corp.
Aurobindo Pharma Limited
AvKARE
AX Pharmaceutical Corp
Bryant Ranch Prepack
Camber Pharmaceuticals, Inc.
Cipla Ltd.
Darmerica, LLC
Hetero Drugs Limited
Macleods Pharmaceuticals Limited
PD-Rx Pharmaceuticals, Inc.
PROFESSIONAL COMPOUNDING CENTERS OF AMERICA
Proficient Rx LP
Rising Pharma Holdings, Inc.
Shanghai Pharma Group Changzhou Kony Pharmaceutical Co., Ltd.
Signa S.A. de C.V.
Teva Pharmaceuticals USA, Inc.

Why It Matters

Sectors
Health
Downstream Uses

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

  • •Famciclovir
FDA Shortage Status
No FDA shortage records

Vendor Pricing

$1.92/gAaron Chemicals LLC
CountryHong Kong
Pack$958.00 / 500 g
Purity98%
Vendors27 available

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

26 more vendors
VendorCountry$/gPackPurity
Angene ChemicalChina → Hong Kong$2.05500 g98%
A2B Chem LLCUnited States$2.7225 g97%
BLD Pharmatech Co., LimitedUnited States$2.80100 g97%
BLD Pharmatech GmbHGermany$2.80100 g97%
BLD Pharmatech Ltd.China$2.80100 g97%
Ambeed, Inc.United States$2.80100 g97%
AK Scientific SpecializedUnited States$2.80100 g95%
Combi-Blocks, Inc.United States$2.80100 g98%
AA BLOCKSUnited States$3.0425 g97%
AK Scientific, Inc.United States$3.75100 g98%
AstaTech, IncUnited States$3.7625 g95%
Angene International LimitedUnited States$6.11100 g98%
MedKoo Biosciences, IncUnited States$130.005 g98%
TargetMol ChemicalsChina → United States$290.00500 mg99.99%
Sigma-Aldrich (Rush Stock)Germany$331.051 g—
Sigma-AldrichGermany$331.051 g—
MolnovaChina$378.00500 mg99%
MedChemExpress MCESweden$442.86500 mg99.69%
TargetMol Chemicals EUAustria$650.00100 mg99.99%
Apexbio Technology LLCUnited States$900.00100 mg99.98%
Cayman EuropeEstonia$1161.44250 mg98%
Princeton BioMolecular Research (SC)United States$2900.00100 mg90%
Vitas M Chemical LimitedHong Kong$3170.00100 mg90%
AngeneChina → Hong Kong$4266.6730 mg98%
Key Organics Ltd.United Kingdom$6900.0010 mg97%
TimTec, LLCUnited States$16000.0030 mg90%

Chemical Identity

CAS104227-87-4
PubChem CID3324
DTXSIDDTXSID0023038
FormulaC14H19N5O4
Mol. Weight321.33 g/mol
SMILESCC(=O)OCC(CCN1C=NC2=CN=C(N=C21)N)COC(=O)C

Data Sources

← Back to Dashboard← Back to Health

Brief citations

Famciclovir (CAS 104227-87-4) https://chemicalindependence.com/chemical/104227-87-4/ PubChem: 3324. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/3324 FDA National Drug Code directory: CAS 104227-87-4. 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 293359 for CAS 104227-87-4. Reporting year: 2024. https://usatrade.census.gov/