CFR›Title 21›Chapter I›Part 216›Subpart B ContainsSections 216.23–216.24CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart B—Compounded Drug Products Sections 216.23 § 216.23 Bulk drug substances that can be used to compound drug products in accordance with section 503A of the Federal Food, Drug, and Cosmetic Act. 216.24 § 216.24 Drug products withdrawn or removed from the market for reasons of safety or effectiveness.