{"data":{"id":"us/21-cfr-556.344","jurisdiction":"us","citation":"21 CFR 556.344","heading":"Ivermectin.","body":"(a) Acceptable daily intake (ADI). The ADI for total residue of ivermectin is 5 µg/kg of body weight per day.\n(b) Tolerances. The tolerances for 22,23-dihydroavermectin B1a (marker residue) are:\n(1) American bison. Liver (target tissue): 15 ppb.\n(2) Cattle. (i) Liver (target tissue): 1.6 ppm.\n(ii) Muscle: 650 ppb.\n(3) Reindeer. Liver (target tissue): 15 ppb.\n(4) Sheep. Liver (target tissue): 30 ppb.\n(5) Swine. (i) Liver (target tissue): 20 ppb.\n(ii) Muscle: 20 ppb.\n(c) Related conditions of use. See §§ 520.1192, 520.1195, 520.1197, 522.1192, 522.1193, 524.1193, and 558.300 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":"a279fc55e7a278551909acdbb4a59ec12e8c4b252c77292e989c2ba8c5dd52b1","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-556.330","next":"us/21-cfr-556.345"},"notice":"GroundRules: Original legal text. Not legal advice."}