{"data":{"id":"us/21-cfr-520.2123b","jurisdiction":"us","citation":"21 CFR 520.2123b","heading":"b Spectinomycin powder.","body":"(a) Specifications. Each gram (g) of powder contains spectinomycin dihydrochloride pentahydrate equivalent to 0.5 g spectinomycin.\n(b) Sponsor. See No. 061133 in § 510.600(c) of this chapter.\n(c) Related tolerances. See § 556.600 of this chapter.\n(d) Conditions of use in chickens. It is administered in the drinking water of growing chickens as follows:\n(1) Indications for use and amounts. (i) As an aid in controlling infectious synovitis due to Mycoplasma synoviae in broiler chickens, administer 1 g per gallon of water as the only source of drinking water for the first 3 to 5 days of life.\n(ii) As an aid in the prevention or control of losses due to CRD associated with M. gallisepticum (PPLO) in growing chickens, administer 2 g per gallon of water as the only source of drinking water for the first 3 days of life and for 1 day following each vaccination.\n(2) Limitations. Do not administer to laying chickens. Do not administer within 5 days of slaughter. 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":"38928c5aff73fc64d9cf0e6921203e249282a77991b4b9a04a77bb09db8406b9","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-520.2123a","next":"us/21-cfr-520.2123c"},"notice":"GroundRules: Original legal text. Not legal advice."}