{"data":{"id":"us/21-cfr-520.1248","jurisdiction":"us","citation":"21 CFR 520.1248","heading":"Levothyroxine.","body":"(a) Specifications. Each tablet contains 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 1.0 milligrams (mg) levothyroxine sodium.\n(b) Sponsors. See Nos. 059051 and 061690 in § 510.600(c) of this chapter.\n(c) Conditions of use—(1) Amount. Administer by mouth as follows:\n(i) No. 061690: 0.1 mg/10 pounds (lb) body weight (0.022 mg/kilogram (kg)) as a single dose every 24 hours or as a divided dose every 12 hours.\n(ii) No. 059051: 0.1 mg/10 lb (0.01 mg/lb, 0.022 mg/kg) body weight twice daily.\n(2) Indications for use. For replacement therapy for diminished thyroid function in dogs.\n(3) Limitations. Federal law restricts this drug to use by or on the order of a licensed veterinarian.","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 520—ORAL DOSAGE FORM NEW ANIMAL DRUGS"],"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":"54684e1581d5f1aaa075deb65c6d7b162a70e544445a7b865b18b77dbee03ca5","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-520.1242g","next":"us/21-cfr-520.1263"},"notice":"GroundRules: Original legal text. Not legal advice."}