---
kind: "section"
citation: "21 C.F.R. § 520.2382"
title: "21"
number: "520.2382"
heading: "Thiabendazole and triclorfon."
url: "https://uscodex.org/cfr/21/520.2382"
---

# §520.2382. Thiabendazole and triclorfon.

- (a) **Specifications.** The drug contains 5 grams of thiabendazole with 4.5 grams of trichlorfon, or 20 grams of thiabendazole with 18 grams of trichlorfon.
- (b) **Sponsor.** See No. 017135 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Conditions of use in horses—**
  - (1) **Amount.** Administer 2 grams of thiabendazole with 1.8 grams of trichlorfon per 100 pounds of body weight sprinkled on the animals' usual daily ration of feed, or may be mixed in 5 to 10 fluid ounces of water and administered by stomach tube or drench.
  - (2) **Indications for use.** For the treatment and control of bots (Gasterophilus spp.), large strongyles (Strongylus spp.), small strongyles (genera Cyathostomum, Cylicobrachytus, Craterostomum, Oesophagodontus, Poteriostomum), pinworms (Oxyuris spp., Strongyloides spp.), and ascarids (Parascaris spp.).
  - (3) **Limitations.** Do not use in horses intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[40 FR 23071, May 28, 1975, as amended at 48 FR 48229, Oct. 18, 1983; 79 FR 28832, May 20, 2014. Redesignated at 84 FR 39183, Aug. 9, 2019. Redesignated at 88 FR 27699, May 3, 2023]

### Authority

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

### Source

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

### Amendments

[40 FR 23071, May 28, 1975, as amended at 48 FR 48229, Oct. 18, 1983; 79 FR 28832, May 20, 2014. Redesignated at 84 FR 39183, Aug. 9, 2019. Redesignated at 88 FR 27699, May 3, 2023]