Guide on Drug Substance Postapproval Changes

Federal Register notice: FDA has made available a draft guidance entitled “Postapproval Changes to Drug Substances.” The document covers facility, scale, and equipment changes associated with all steps of drug substance manufacturing; specification changes to starting materials, raw materials, intermediates, and the unfinished and final drug substance; synthetic manufacturing process changes; changes in the source of drug substance; and change to container closure system of the drug substance. To view the notice, click here.

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