CFR > 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 (parts 500 to 590) > PART 520—ORAL DOSAGE FORM NEW ANIMAL DRUGS > 520.1120b—Haloxon boluses.

520.1120b—Haloxon boluses.

(a) Chemical name. 3-Chloro-7-hydroxy-4-methylcoumarin bis (2-chloroethyl) phosphate.
(b) Specifications. Each bolus contains 10.1 grams of haloxon.
(c) Sponsor. See No. 000061 in § 510.600(c) of this chapter.
(d) Related tolerances. See § 556.310 of this chapter.
(e) Conditions of use. (1) Haloxon bolus is an anthelmintic used in cattle for the control of gastrointestinal roundworms of the genera Haemonchus, Ostertagia, Trichostrongylus and Cooperia.
(2) It is administered by giving one bolus per approximately 500 pounds body weight (35 to 50 milligrams per kilogram of body weight).
(3) For most effective results, re-treat animals in 3 to 4 weeks. If reinfection is likely to occur, additional re-treatments may be necessary.
(4) Do not use any drug, pesticide or other chemical having cholinesterase inhibiting activity either simultaneously or within a few days before or after treatment with haloxon.
(5) Do not treat animals within one week of slaughter.
(6) Do not treat dairy animals of breeding age or older.

Code of Federal Regulations

[40 FR 13838, Mar. 27, 1975, as amended at 44 FR 61591, Oct. 29, 1979; 46 FR 48642, Oct. 2, 1981; 61 FR 8873, Mar. 6, 1996; 62 FR 61625, Nov. 19, 1997]