List of Bulk Drug Substances for Which There Is a Clinical Need Under Section 503B of the Federal Food, Drug, and Cosmetic Act; Extension of Comment Period

The Food and Drug Administration (FDA or the Agency) is extending the comment period for the notice entitled "List of Bulk Drug Substances for Which There Is a Clinical Need Under Section 503B of the Federal Food, Drug, and Cosmetic Act" that appeared in the Federal Register of May 1, 2026. In the Federal Register notice, FDA requested comments on FDA's proposal not to include semaglutide, tirzepatide, or liraglutide on a list of bulk drug substances (active pharmaceutical ingredients) for which there is a clinical need for outsourcing facilities to use in compounding (the 503B Bulks List). The Agency is taking this action in response to a request for an extension to allow interested persons additional time to submit comments.