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Presenter details examples of secondary DMF relationships and multi‑level manufacturing chains
Summary
Using hypothetical chains, the presenter showed how primary DMFs can reference secondary DMFs that themselves reference additional DMFs, how salt forms and physical-form changes are handled, and why nested references can complicate facility and impurity evaluations.
The presenter walked through a hypothetical manufacturing chain in which a primary DMF for an API salt refers to a secondary DMF for an intermediate API base, which in turn refers to another secondary DMF for an upstream intermediate. "In this example, primary DMF 1 for the synthesis of its final drug substance API salt, that is e, refers to a secondary DMF that's intermediate d, which itself is an API base," the presenter said.
The presentation included several practical examples—salt exchanges between primary and secondary DMFs, sterile-to-nonsterile references, premixes where one API is produced via a secondary DMF, and changes in physical form (for example, anhydrous to monohydrate). The presenter warned that chains with multiple secondary DMFs (sometimes more than five) can significantly affect review timelines and urged applicants to be aware of associated secondary DMFs when planning submissions.
