{"data":{"id":"us/21-cfr-520.763a","jurisdiction":"us","citation":"21 CFR 520.763a","heading":"a Dithiazanine tablets.","body":"(a) Specifications. Each tablet contains 10, 50, 100, or 200 milligrams (mg) dithiazanine iodide.\n(b) Sponsor. See No. 069043 in § 510.600(c) of this chapter.\n(c) Conditions of use in dogs—(1) Indications for use and amount. Administer orally immediately after feeding as follows:\n(i) For large roundworms (Toxocara canis, Toxascaris leonina): 10 mg per pound (/lb) of body weight for 3 to 5 days;\n(ii) For hookworms (Ancylostoma caninum, Uncinaria stenocephala) and whipworms (Trichuris vulpis): 10 mg/lb of body weight for 7 days;\n(iii) For Strongyloides (Strongyloides canis, Strongyloides stercoralis): 10 mg/lb of body weight for 10 to 12 days;\n(iv) For heartworm microfilariae (Dirofilaria immitus): 3 to 5 mg/lb of body weight for 7 to 10 days. Treatment for heartworm microfilariae should follow 6 weeks after therapy for adult worms.\n(2) 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":"04b0a6c3cddf61fcb838b4e0f25244ca92df431b3b2a72a504619105ee364d5b","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-520.763","next":"us/21-cfr-520.763b"},"notice":"GroundRules: Original legal text. Not legal advice."}