{"data":{"id":"us/21-cfr-520.1422","jurisdiction":"us","citation":"21 CFR 520.1422","heading":"Metoserpate hydrochloride.","body":"(a) Chemical name. Methyl-o-methyl-18-epireserpate hydrochloride.\n(b) Sponsor. See No. 054771 in § 510.600(c) of this chapter.\n(c) Related tolerances. See § 556.410 of this chapter.\n(d) Conditions of use. It is used in drinking water for replacement chickens as follows:\n(1) Amount. 568.5 milligrams per gallon (0.015 percent).\n(i) Indications for use. As a tranquilizer for flock treatment of chickens prior to handling.\n(ii) Limitations. To be used one time as a treatment for replacement chickens up to 16 weeks of age; usual drinking water should be withheld prior to treatment to provide adequate consumption of medicated drinking water; not for use in laying chickens; chickens slaughtered within 72 hours following treatment must not be used for food.\n(2) Amount. 2 to 4 milligrams per 2.2 pounds of body weight.\n(i) Indications for use. As an aid in control of hysteria.\n(ii) Limitations. To be used as a treatment for replacement chickens up to 16 weeks of age; usual drinking water should be withheld prior to treatment to provide adequate consumption of medicated drinking water; the drug should be administered at a dosage level of 4 milligrams per 2.2 pounds of body weight followed by 2 treatments at 4-day intervals of 2 milligrams per 2.2 pounds of body weight; not for use in laying chickens; chickens slaughtered within 72 hours following treatment must not be used for food.","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":"c257bdfd6cd3a829bcbab7e07b0804d2546140ef26d5c206307145ccdf249f01","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-520.1409","next":"us/21-cfr-520.1425"},"notice":"GroundRules: Original legal text. Not legal advice."}