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Panel: USP monograph is a baseline for specifications but manufacturing context matters
Summary
Panelists advised that a USP monograph sets minimum expectations for a material but specifications and impurity controls depend on how the intermediate is manufactured and where impurities are controlled in the synthesis.
An attendee asked whether a secondary DMF substance that appears in a USP monograph may be used as a general raw-material specification for a primary DMF. Madhu (speaker 3) said USP monographs are a useful starting point but are minimum expectations: "The USP monograph, I would say it's a minimum, but it depends on how you manufactured the drug substance." Panelists said specifications must reflect how the intermediate is used and where impurities are controlled in the overall synthesis.
Speakers gave examples where an intermediate's impurities are only controlled later in the primary process; in those cases, relying solely on a USP monograph for upstream specifications may be insufficient. One panelist emphasized that if an intermediate is the only place an impurity is controlled, additional guidance (for example, ICH Q3A) could come into play, and applicants should document their rationale for chosen specifications.
