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 > 520.1120a—Haloxon drench.

520.1120a—Haloxon drench.

(a) Chemical name. 3-Choloro-7-hydoxy-4-methylcoumarin bis (2-chloroethyl) phosphate.
(b) Specifications. Haloxon assay of not less than 96 percent by infrared spectrum at 8.62 microns.
(c) Sponsor. See No. 000061 in § 510.600(c) of this chapter.
(d) Special considerations. Do not use any drug, insecticide, pesticide, or other chemical having cholinesterase-inhibiting activity either simultaneously or within a few days before or after treatment with haloxon.
(e) Related tolerances. See § 556.310 of this chapter.
(f) Conditions of use. It is used as a drench as follows:
(1) Cattle— (i) Amount. 141.5 grams per packet.
(ii) Indications for use. Control of gastrointestinal roundworms of the genera Haemonchus, Ostertagia, Trichostrongylus, and Cooperia.
(iii) Limitations. (a) Dissolve each packet in 32 fluid ounces of water and administer as follows:
Weight of animal (pounds) Dose (fluid ounces)
Up to 100 1/2
100 to 150 3/4
150 to 200 1
200 to 300 11/2
300 to 450 2
450 to 700 3
700 to 1,000 4
1,000 to 1,200 5
Over 1,200 6
(b) Do not treat within 1 week of slaughter; do not treat dairy animals of breeding age; animals should be retreated in 3 to 4 weeks.

Code of Federal Regulations

[40 FR 13838, Mar. 27, 1975, as amended at 45 FR 10333, Feb. 15, 1980; 46 FR 48642, Oct. 2, 1981; 61 FR 8873, Mar. 6, 1996; 62 FR 61624, Nov. 19, 1997]