Oseltamivir phosphate

Drug ingredient

CAS 204255-11-8

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

US productionNot reported

Top sourceNo public record

This chemical is not on EPA’s Toxic Substances Control Act inventory, the list behind EPA’s production survey.

Why supply is unknown

Where It Comes From

EPA and Census publish no US supply data for this chemical.

54 FDA-registered drug labelers

A-S Medication Solutions

Ajanta Pharma USA Inc.

Alembic Pharmaceuticals Inc.

Alembic Pharmaceuticals Limited

Alvogen Inc.

American Pacific Corporation

Amneal Pharmaceuticals NY LLC

Asclemed USA, Inc.

Aurobindo Pharma Limited

AvKARE

AX Pharmaceutical Corp

Azico Biophore India Private Limited

BrightGene Bio-Medical Technology Co., Ltd.

Camber Pharmaceuticals, Inc.

Chromo Laboratories India Private Limited

Cipla Ltd.

Cipla USA, Inc

Dasami Lab Private Limited

Delpharm Milano Srl

EPIC PHARMA, LLC

Exelan Pharmaceuticals, Inc.

FUJIAN FUKANG PHARMACEUTICAL CO., LTD.

Genentech, Inc.

HEC Pharm USA Inc.

Hetero Labs Limited

Lannett Company, Inc.

Laurus Labs Limited

Leading Pharma, LLC

Lupin Pharmaceuticals, Inc.

Macleods Pharmaceuticals Limited

Matrix Pharmacorp Private Limited

MSN LABORATORIES PRIVATE LIMITED

MSN Life Sciences Private Limited

MSN Pharmachem Private Limited

Novadoz Pharmaceuticals LLC

NuCare Pharmaceuticals, Inc.

Oryza Pharmaceuticals Inc.

PATHEON API, INC

Patheon Manufacturing Services LLC

Preferred Pharmaceuticals Inc.

Proficient Rx LP

Redpharm Drug

REMEDYREPACK INC.

Shanghai Desano Chemical Pharmaceutical Co., Ltd.

Slate Run Pharmaceuticals, LLC

SOLARA ACTIVE PHARMA SCIENCES LIMITED

Sportpharm LLC

Sportpharm, Inc. dba Sportpharm

Strides Pharma Science Limited

Teva Pharmaceuticals USA, Inc.

ZHEJIANG HUAHAI PHARMACEUTICAL CO., LTD.

Zhejiang Poly Pharm. Co., Ltd.

Zydus Lifesciences Limited

Zydus Pharmaceuticals USA Inc.

Why It Matters

Sectors

Health

Downstream Uses

Appears in 5 drug and cosmetic product listings (FDA).

•Oseltamivir Phosphate
•Oseltamivir Phosphate for Oral Suspension
•Oseltamivir
•oseltamavir phosphate
•Tamiflu

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 Shortage

Shortage History

Rows group FDA shortage filings by drug product. Each manufacturer makes its own FDA shortage filing, so one product can carry several reports at once: Available, Limited Availability, Unavailable or to be discontinued.

to be discontinued
Oseltamivir Phosphate Capsule
Shortage listed since July 8, 2025

See all current drug shortages

Chemical Identity

CAS204255-11-8

PubChem CID78000

DTXSIDDTXSID0044230

FormulaC16H31N2O8P

Mol. Weight410.4 g/mol

SMILESCCC(CC)OC1C=C(CC(C1NC(=O)C)N)C(=O)OCC.OP(=O)(O)O

Data Sources

PubChem · compound 78000Retrieved 2026-04-07
FDA National Drug Code directoryRetrieved 2026-04-25
FDA Drug ShortagesRetrieved 2026-10-04

← Back to Dashboard ← Back to Health

Brief citations

Oseltamivir phosphate (CAS 204255-11-8) https://chemicalindependence.com/chemical/204255-11-8/ PubChem: 78000. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/78000 FDA National Drug Code directory: CAS 204255-11-8. Retrieved 2026-04-25. https://open.fda.gov/data/ndc/ FDA Drug Shortages: CAS 204255-11-8. Retrieved 2026-10-04. https://www.accessdata.fda.gov/scripts/drugshortages/