What is DMF?

DMF status is a key qualification check when sourcing an active pharmaceutical ingredient.

A DMF is a confidential package of chemistry, manufacturing, and controls (CMC) information filed with a regulatory authority — most commonly the FDA in the US. It describes the facility, process, and controls behind an active ingredient, intermediate, packaging component, or excipient in enough detail for the authority to assess quality, without exposing that proprietary detail to the customer.

Critically, the DMF is held by the supplier, not the sponsor. It lets a supplier disclose proprietary manufacturing detail to the regulator while sharing only what a customer needs in order to reference it.

A DMF is not submitted with a drug application directly. Instead, the holder issues a Letter of Authorization (LoA) permitting a specific applicant to reference the DMF in their own NDA or ANDA. When that application is reviewed, the FDA examines the referenced DMF as supporting evidence for the active ingredient's quality.

This is why a supplier's willingness to grant an LoA — and the DMF's review status — is a core checkpoint when qualifying an API source for a regulated market.

The FDA recognizes several DMF types: Type II (drug substance / API, intermediates, and materials used in their preparation), Type III (packaging materials), Type IV (excipients, colorants, and flavors), and Type V (other accepted reference information). Type I, covering manufacturing sites and facilities, was discontinued in 2000.

For active-ingredient sourcing, Type II is the one that matters — it is the filing an API manufacturer holds to support its customers' US applications. A held Type II DMF signals a supplier is organized to supply the regulated US market.

No — and this is a common misconception. The FDA does not approve or reject a DMF on its own; it reviews the file only in the context of a referencing application. A DMF on record means the supplier has documented its process to the agency, not that the site is currently in good GMP standing.

That is why DMF status should be read alongside the site's live compliance record — Warning Letters, Form 483 observations, and recalls — rather than treated as a clearance. PharmaTek's API directory lists FDA Type II DMF holders per active ingredient so you can pair the filing signal with the supplier's inspection history.