{"data":{"id":"us/21-cfr-516.26","jurisdiction":"us","citation":"21 CFR 516.26","heading":"Amendment to MUMS-drug designation.","body":"(a) At any time prior to conditional approval or approval of an application for a MUMS-designated drug, the sponsor may apply for an amendment to the designated intended use if the proposed change is due to new and unexpected findings in research on the drug, information arising from FDA recommendations, or other unforeseen developments.\n(b) FDA will grant the amendment if it finds:\n(1) That the initial designation request was made in good faith;\n(2) That the amendment is intended to make the MUMS-drug designated intended use conform to the results of new and unexpected findings in research on the drug, information arising from FDA recommendations, or other unforeseen developments; and\n(3) In the case of a minor use, that as of the date of the submission of the amendment request, the amendment would not result in the intended use of the drug no longer being considered a minor use.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER E—ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS","PART 516—NEW ANIMAL DRUGS FOR MINOR USE AND MINOR SPECIES","Subpart B—Designation of a Minor Use or Minor Species New Animal Drug"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"73c9b7f72bac793b9af0d0c8d00f13aa1a30716d6e3d2a6cff008673e23e2aa4","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-516.25","next":"us/21-cfr-516.27"},"notice":"GroundRules: Original legal text. Not legal advice."}