---
kind: "section"
citation: "21 C.F.R. § 520.1630"
title: "21"
number: "520.1630"
heading: "Oxfendazole suspension."
url: "https://uscodex.org/cfr/21/520.1630"
---

# §520.1630. Oxfendazole suspension.

- (a) **Specifications.** Each milliliter of suspension contains:
  - (1) 90.6 milligrams (mg) oxfendazole (9.06 percent).
  - (2) 225.0 mg oxfendazole (22.5 percent).
- (b) **Sponsor.** See Nos. 000010 and 054771 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances. See—** [§ 556.495](/cfr/21/556.495.md) of this chapter.
- (d) **Special considerations.** See [§ 500.25](/cfr/21/500.25.md) of this chapter. If labeled for administration by stomach tube: Federal law restricts this drug to use by or on the order of a licensed veterinarian.
- (e) **Conditions of use—**
  - (1) **Horses.** Use the product described in [paragraph (a)(1)](#a-1) of this section as follows:
    - (i) **Amount.** 10 mg per kilogram (/kg) of body weight by stomach tube or dose syringe. Horses maintained on premises where reinfection is likely to occur should be retreated in 6 to 8 weeks.
    - (ii) **Indications for use.** For removal of large roundworms (Parascaris equorum), mature and 4th stage larvae pinworms (Oxyuris equi), large strongyles (Strongylus edentatus, S. vulgaris, and S. equinus), and small strongyles.
    - (iii) **Limitations.** Withholding feed or water prior to use is unnecessary. Administer drug with caution to sick or debilitated horses. Do not use in horses intended for human consumption.
  - (2) **Cattle.** Use the products described in paragraphs [(a)(1)](#a-1) and [(a)(2)](#a-2) of this section as follows:
    - (i) **Amount.** 4.5 mg/kg of body weight by dose syringe. Treatment may be repeated in 4 to 6 weeks.
    - (ii) **Indications for use.** For the removal and control of: lungworms (Dictyocaulus viviparus—adult, L4); stomach worms: barberpole worms (Haemonchus contortus and H. placei—adult), small stomach worms (Trichostrongylus axei—adult), brown stomach worms (Ostertagia ostertagi—adult, L4, inhibited L4); intestinal worms; nodular worms (Oesophagostomum radiatum—adult), hookworms (Bunostomum phlebotomum—adult), small intestinal worms (Cooperia punctata, C. oncophora, and C. surnabada—adult, L4), and tapeworms (Moniezia benedeni—adult).
    - (iii) **Limitations.** Cattle must not be slaughtered until 7 days after treatment. Because a withdrawal time in milk has not been established, do not use in female dairy cattle of breeding age.

## Notes

### Amendments

[55 FR 46943, Nov. 8, 1990, as amended at 56 FR 8710, Mar. 1, 1991; 61 FR 5506, Feb. 13, 1996; 72 FR 10596, Mar. 9, 2007; 73 FR 45610, Aug. 6, 2008; 75 FR 10166, Mar. 5, 2010; 78 FR 28825, May 20, 2014]

### Authority

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

### Source

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

### Amendments

[55 FR 46943, Nov. 8, 1990, as amended at 56 FR 8710, Mar. 1, 1991; 61 FR 5506, Feb. 13, 1996; 72 FR 10596, Mar. 9, 2007; 73 FR 45610, Aug. 6, 2008; 75 FR 10166, Mar. 5, 2010; 78 FR 28825, May 20, 2014]