What Is a Drug Master File (DMF)?
An API DMF (Drug Master File) is a confidential submission to a regulatory authority that contains detailed information about the manufacture, processing, quality control and packaging of an active pharmaceutical ingredient. It allows an API manufacturer to share sensitive technical details with the regulator without revealing them to the customer who uses the API in a finished product.
This guide explains what a DMF is, how it works, how it differs from an ASMF and a CEP, and what buyers should know when a supplier says it has a DMF.
Key Takeaways
- A DMF is a confidential file submitted by the API manufacturer to the regulator.
- It is not an approval. The regulator reviews a DMF only in connection with a finished product application that refers to it.
- Customers get a Letter of Authorisation (LOA) that lets the regulator refer to the DMF for their application.
- Different regions use different systems, such as the US DMF, the EU ASMF and the European CEP.
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What Is a Certificate of Analysis?
A CoA confirms that a batch was tested and states whether it complies with the specification. For APIs, the specification is usually based on a pharmacopoeia such as IP, BP, USP or Ph. Eur., or on an agreed in-house standard.
What Is a Drug Master File?
A DMF is a submission, usually by an API manufacturer, to a regulator such as the US Food and Drug Administration (FDA). It holds confidential information about the facilities, processes and controls used to make an API (or another material such as an intermediate, excipient or packaging component). The aim is to protect the manufacturer’s know-how while still allowing the regulator to assess an application that uses that material.
How a DMF Works
- The API manufacturer submits the DMF to the regulator.
- A customer, usually a finished product manufacturer, files an application (for example, an ANDA in the United States) that refers to the DMF.
- The API manufacturer issues a Letter of Authorisation that lets the regulator use the DMF for that customer’s application.
- The regulator reviews the DMF as part of reviewing the application and may ask questions.
A DMF is not approved or rejected by itself. It is reviewed only when it is referenced.
What a DMF Typically Contains
The exact format varies by region, but an API file generally covers:
- manufacturer and site information
- description of the manufacturing process and controls
- raw materials, starting materials and intermediates
- specifications and analytical methods
- impurity profile and control strategy
- stability data and retest period
- container closure system
Many parts follow the Common Technical Document (CTD) structure.
Open Part and Restricted Part
Many systems split the file into two parts:
- Applicant’s (open) part: information the finished product manufacturer needs to see
- Restricted (closed) part: confidential details, such as detailed process information, that only the regulator sees
DMF vs ASMF vs CEP
| System | Used in | Notes |
|---|---|---|
| US DMF | United States | Submitted to the FDA and referenced in applications such as ANDAs |
| ASMF (Active Substance Master File) | European Union | Similar split between applicant and restricted parts |
| CEP (Certificate of Suitability) | Europe | A certificate issued by EDQM showing that an API's quality is suitably controlled by the European Pharmacopoeia |
Other countries have their own requirements, and some accept DMF or ASMF information in the finished product file.
Why a DMF Matters for Buyers
- Faster, smoother filings. The finished product applicant can refer to the file instead of collecting every detail.
- Confidentiality. The API supplier does not have to share its process.
- Regulatory confidence. A well-maintained file shows documented quality systems.
Questions to Ask a Supplier
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- Do you hold a DMF, ASMF or CEP for this API, and in which regions?
- What is the current status and are you keeping the file updated?
- Will you provide a Letter of Authorisation for my filing?
- Who is the holder, and does it match the manufacturing site?
- What other regulatory documents can you provide?
See documents to request from an API supplier and how to evaluate a pharmaceutical API supplier.
DMF and Markets in Africa
Registration rules differ by country. Regulators such as NAFDAC in Nigeria, the Pharmacy and Poisons Board in Kenya and the Ghana FDA each set their own requirements, and the API information they ask for is often part of the finished product dossier. Check the current guidance of your regulator.
Regulatory Support at Salvavidas Pharma
Salvavidas Pharma is a WHO-GMP certified pharmaceutical manufacturer and exporter based in Surat, Gujarat, India. See our regulatory services.
Frequently Asked Questions
What does DMF stand for?
Drug Master File.
Is a DMF a regulatory approval?
No. It is a confidential submission that the regulator reviews only when a finished product application refers to it.
Who files a DMF?
Usually the API manufacturer, or another holder of the material, such as an excipient or packaging supplier.