Penciclovir

Drug ingredient

CAS 39809-25-1

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

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

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

IE 61%IrelandCH 30%SwitzerlandGB 2%United KingdomCN 2%ChinaIN 1%India

Israel
Bulgaria
Japan
Spain
Sweden
Canada
Taiwan
Finland
Portugal
Mexico
Belgium
Hungary
Austria
Brazil
Ukraine
Croatia
Malta
South Korea
South Africa
Denmark
Czech Republic
Malaysia
Argentina
Poland
Cameroon
Australia
Hong Kong
Slovakia
Latvia

10 FDA-registered drug labelers

Amneal Pharmaceuticals NY LLC

DARMERICA, LLC

Maithri Drugs Private Limited

Mylan Pharmaceuticals Inc.

Padagis Israel Pharmaceuticals Ltd

Shanghai Pharma Group Changzhou Kony Pharmaceutical Co., Ltd.

SMS Pharmaceuticals Limited

Teva Pharmaceuticals USA, Inc.

Torrent Pharmaceuticals Limited

Zhejiang Charioteer Pharmaceutical Co., Ltd.

Why It Matters

Sectors

Health

Downstream Uses

Appears in 2 drug and cosmetic product listings (FDA).

•Penciclovir
•Denavir

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

$5.00/gCombi-Blocks, Inc.

CountryUnited States

Pack$500.00 / 100 g

Purity98%

Vendors9 available

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

8 more vendors

Vendor	Country	$/g	Pack	Purity
BLD Pharmatech Co., Limited	United States	$5.67	100 g	98%
BLD Pharmatech GmbH	Germany	$5.67	100 g	98%
BLD Pharmatech Ltd.	China	$5.67	100 g	98%
Ambeed, Inc.	United States	$5.67	100 g	98%
AstaTech, Inc	United States	$8.00	25 g	95%
MedChemExpress MCE	Sweden	$496.10	100 mg	99.92%
Axon Medchem	Netherlands	$1440.00	50 mg	99%
Key Organics Ltd.	United Kingdom	$6900.00	10 mg	97%

Chemical Identity

CAS39809-25-1

PubChem CID135398748

DTXSIDDTXSID9046491

FormulaC10H15N5O3

Mol. Weight253.26 g/mol

SMILESC1=NC2=C(N1CCC(CO)CO)N=C(NC2=O)N

Data Sources

PubChem · compound 135398748Retrieved 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

Penciclovir (CAS 39809-25-1) https://chemicalindependence.com/chemical/39809-25-1/ PubChem: 135398748. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/135398748 FDA National Drug Code directory: CAS 39809-25-1. 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 39809-25-1. Reporting year: 2024. https://usatrade.census.gov/