US lawFederal (United States)RegulationsTitle 21 CFR — Food and DrugsChapter I — FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICESPart 530 — EXTRALABEL DRUG USE IN ANIMALSSubpart A — General Provisions530.121 C.F.R. § 530.1Scope.Last amended: 2016Year: 2026Length: 39 wordsOfficial source Cite as 21 C.F.R. § 530.1 (2026)This part applies to the extralabel use in an animal of any approved new animal drug or approved new human drug by or on the lawful order of a licensed veterinarian within the context of a valid veterinary-client-patient relationship.Next21 C.F.R. § 530.2