---
kind: "section"
citation: "21 C.F.R. § 520.260"
title: "21"
number: "520.260"
heading: "n -Butyl chloride."
url: "https://uscodex.org/cfr/21/520.260"
---

# §520.260. n -Butyl chloride.

- (a) **Specifications.** Each capsule contains 221, 442, 884, or 1,768 milligrams (mg); or 4.42 grams of n-butyl chloride.
- (b) **Sponsors.** See sponsors in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter:
  - (1) **No.** 023851 for capsules containing 221, 442, 884, or 1,768 mg, or 4.42 grams (g); and
  - (2) **No.** 054771 for capsules containing 221 mg.
- (c) **Conditions of use in dogs—**
  - (1) **Amount.** Administer capsules orally based on body weight as follows:
    - (i) **Capsules containing 221 mg—** Under 5 pounds, 1 capsule per 1 1/4 pounds of body weight.
    - (ii) **Capsules containing 442 mg—** Under 5 pounds, 1 capsule per 2 1/2 pounds of body weight.
    - (iii) **Capsules containing 884 mg—**
      - (A) Under 5 pounds, 1 capsule;
      - (B) 5 to 10 pounds, 2 capsules;
      - (C) 10 to 20 pounds, 3 capsules;
      - (D) 20 to 40 pounds, 4 capsules;
      - (E) **Over 40 pounds, 5 capsules.**
    - (iv) **Capsules containing 1,768 mg—** Dogs weighing 5 to 10 pounds, 1 capsule.
    - (v) Capsules containing 4.42 g: Dogs weighing 40 pounds or over, 1 capsule.
  - (2) **Indications for use.** For the removal of ascarids (Toxocara canis and Toxascaris leonina) and hookworms (Ancylostoma caninum, Ancylostoma braziliense, and Uncinaria stenocephala) from dogs.
  - (3) **Limitations.** Dogs should not be fed for 18 to 24 hours before being given the drug. Administration of the drug should be followed in 1/2 to 1 hour with a mild cathartic. Normal feeding may be resumed 4 to 8 hours after treatment. Animals subject to reinfection may be retreated in 2 weeks. A veterinarian should be consulted before using in severely debilitated dogs.

## Notes

### Amendments

[86 FR 10819, Feb. 23, 2021]

### Authority

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

### Source

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

### Amendments

[86 FR 10819, Feb. 23, 2021]