{"data":{"id":"us/21-cfr-520.1242f","jurisdiction":"us","citation":"21 CFR 520.1242f","heading":"f Levamisol gel.","body":"(a) Specifications. Each gram of gel contains 115 milligrams (11.5 percent) levamisol hydrochloride.\n(b) Sponsor. See No. 054771 in § 510.600(c) of this chapter.\n(c) Related tolerances. See § 556.350 of this chapter.\n(d) Conditions of use—(1) Cattle—(i) Amount. Eight milligrams of levamisole hydrochloride per kilogram of body weight, as a single oral dose.\n(ii) Indications for use. Anthelmintic effective against the following nematode infections: Stomach worms (Haemonchus, Trichostrongylus, Ostertagia), intestinal worms (Trichostrongylus, Cooperia, Nematodirus, Bunostomum, Oesophagostomum), and lungworms (Dictyocaulus).\n(iii) Limitations. Conditions of constant helminth exposure may require re-treatment within 2 to 4 weeks after the first treatment; do not administer to cattle within 6 days of slaughter for food; do not administer to dairy animals of breeding age; consult veterinarian before using in severely debilitated animals.\n(2) Breeding swine—(i) Amount. Eight milligrams per kilogram of body weight (3.6 milligrams per pound) as a single oral dose.\n(ii) Conditions of use. For treating breeding swine infected with the following nematodes: Large roundworms (Ascaris suum), nodular worms (Oesophagostomum spp.), lungworms (Metastrongylus spp.), intestinal threadworms (Strongyloides ransomi), and kidney worms (Stephanurus dentatus).\n(iii) Limitations. May require retreatment in 4 to 5 weeks. Do not use within 11 days of slaughter for food. Consult your veterinarian for assistance before using in severely debilitated animals and in the diagnosis, treatment, and control of parasitism.","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":"65ce47fa463aaafe12fca4360cfd28fd4070d0225af500c153cb8235a3d630c2","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-520.1242e","next":"us/21-cfr-520.1242g"},"notice":"GroundRules: Original legal text. Not legal advice."}