{"data":{"id":"us/21-cfr-520.90c","jurisdiction":"us","citation":"21 CFR 520.90c","heading":"c Ampicillin boluses.","body":"(a) Specifications. Each bolus contains ampicillin trihydrate equivalent to 400 milligrams of ampicillin.\n(b) Sponsor. See No. 054771 in § 510.600(c) of this chapter.\n(c) Related tolerances. See § 556.40 of this chapter.\n(d) Conditions of use in nonruminating calves—(1) Amount. 5 milligrams per pound of body weight twice daily not to exceed 4 days.\n(2) Indications for use. Oral treatment of bacterial enteritis (colibacillosis) caused by E. coli.\n(3) Limitations. Treated calves must not be slaughtered for food during treatment and for 7 days after the last treatment. 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":"58f45a89f361443f2a38b8e9022071a17f615f3211aa2fa2c725b076e6f3a480","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-520.90b","next":"us/21-cfr-520.100"},"notice":"GroundRules: Original legal text. Not legal advice."}