{"data":{"id":"us/21-cfr-556.640","jurisdiction":"us","citation":"21 CFR 556.640","heading":"Sulfadimethoxine.","body":"(a) [Reserved]\n(b) Tolerances. The tolerances for sulfadimethoxine are:\n(1) Catfish and salmonids. Edible tissues: 0.1 ppm.\n(2) Cattle. (i) Edible tissues (excluding milk): 0.1 ppm.\n(ii) Milk: 0.01 ppm.\n(3) Chickens, turkeys, ducks, and chukar partridges. Edible tissues (excluding eggs): 0.1 ppm.\n(c) Related conditions of use. See §§ 520.2220a, 520.2220d, 520.2220e, 522.2220, and 558.575 of this chapter.","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 556—TOLERANCES FOR RESIDUES OF NEW ANIMAL DRUGS IN FOOD","Subpart B—Specific Tolerances for Residues of Approved and Conditionally Approved 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":"006bb34f2f6db6e5d972973b599d538faa9256b79bf7564b2a03d46a95a15968","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-556.630","next":"us/21-cfr-556.650"},"notice":"GroundRules: Original legal text. Not legal advice."}