---
kind: "section"
citation: "21 C.F.R. § 520.905d"
title: "21"
number: "520.905d"
heading: "Fenbendazole powder."
url: "https://uscodex.org/cfr/21/520.905d"
---

# §520.905d. Fenbendazole powder.

- (a) **Specifications.** Each 2-ounce packet contains 2.27 grams (4 percent) fenbendazole.
- (b) **Sponsor.** See No. 000061 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.275](/cfr/21/556.275.md) of this chapter.
- (d) **Conditions of use.** It is administered to swine as follows:
  - (1) **Amount.** 3 milligrams fenbendazole per kilogram body weight per day (1.36 milligrams per pound per day).
  - (2) **Indications for use.** For removal and control of large roundworms (Ascaris suum); lungworms (Metastrongylus apri); nodular worms (Oesophagostomum dentatum, O. quadrispinulatum); small stomach worms (Hyostrongylus rubidus); whipworms (Trichuris suis); and kidneyworms (Stephanurus dentatus— mature and immature).
  - (3) **Limitations.** Thoroughly mix the contents of the packet(s) with swine ration and administer according to label directions. Feed as sole ration for 3 consecutive days. Can be fed to pregnant sows. No prior withdrawal of feed or water is necessary. Consult your veterinarian for assistance in the diagnosis, treatment, and control of parasitism.

## Notes

### Amendments

[49 FR 18090, Apr. 27, 1984, as amended at 49 FR 20485, May 15, 1984; 66 FR 47960, Sept. 17, 2001; 70 FR 32489, June 3, 2005; 74 FR 61516, Nov. 25, 2009; 83 FR 48945, Oct. 9, 2018]

### Authority

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

### Source

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

### Amendments

[49 FR 18090, Apr. 27, 1984, as amended at 49 FR 20485, May 15, 1984; 66 FR 47960, Sept. 17, 2001; 70 FR 32489, June 3, 2005; 74 FR 61516, Nov. 25, 2009; 83 FR 48945, Oct. 9, 2018]