---
kind: "section"
citation: "21 C.F.R. § 520.1120a"
title: "21"
number: "520.1120a"
heading: "Haloxon drench."
url: "https://uscodex.org/cfr/21/520.1120a"
---

# §520.1120a. Haloxon drench.

- (a) **Specifications.** Each packet contains 141.5 grams haloxon.
- (b) **Sponsor.** See No. 000061 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **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.
- (d) **Related tolerances.** See [§ 556.310](/cfr/21/556.310.md) of this chapter.
- (e) **Conditions of use in cattle—**
  - (1) **Amount.** Dissolve each packet in 32 fluid ounces of water and administer as follows: For animals weighing up to 100 pounds: 1/2 fluid ounce; for animals weighing 100 to 150 pounds: 3/4 fluid ounce; for animals weighing 150 to 200 pounds: 1 fluid ounce; for animals weighing 200 to 300 pounds: 1 1/2 fluid ounces; for animals weighing 300 to 450 pounds: 2 fluid ounces; for animals weighing 450 to 700 pounds: 3 fluid ounces; for animals weighing 700 to 1,000 pounds: 4 fluid ounces; for animals weighing 1,000 to 1,200 pounds: 5 fluid ounces; for animals weighing over 1,200 pounds: 6 fluid ounces. Retreat in 3 to 4 weeks.
  - (2) **Indications for use.** For control of gastrointestinal roundworms of the genera Haemonchus, Ostertagia, Trichostrongylus, and Cooperia.
  - (3) **Limitations.** Do not treat dairy animals of breeding age. Do not treat within 1 week of slaughter.

## Notes

### Amendments

[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; 78 FR 28822, May 20, 2014]

### Authority

Authority: 21 U.S.C. 360b.

### Source

Source: 40 FR 13838, Mar. 27, 1975, unless otherwise noted.

### Amendments

[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; 78 FR 28822, May 20, 2014]