---
kind: "section"
citation: "21 C.F.R. § 520.2613"
title: "21"
number: "520.2613"
heading: "Trimethoprim and sulfadiazine powder."
url: "https://uscodex.org/cfr/21/520.2613"
---

# §520.2613. Trimethoprim and sulfadiazine powder.

- (a) **Specifications.** Each gram of powder contains 67 milligrams (mg) trimethoprim and 333 mg sulfadiazine.
- (b) **Sponsors.** See Nos. 054771 and 059051 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Conditions of use in horses—**
  - (1) **Amount.** Administer orally 3.75 grams of powder per 110 pounds (50 kilograms) of body weight in a small amount of feed, as a single daily dose, for 5 to 7 days.
  - (2) **Indications for use.** For control of bacterial infections of horses during treatment of acute strangles, respiratory tract infections, acute urogenital infections, wound infections, and abscesses.
  - (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

[58 FR 36135, July 6, 1993, as amended at 64 FR 68289, Dec. 7, 1999; 79 FR 28834, May 20, 2014; 79 FR 64116, Oct. 28, 2014]

### Authority

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

### Source

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

### Amendments

[58 FR 36135, July 6, 1993, as amended at 64 FR 68289, Dec. 7, 1999; 79 FR 28834, May 20, 2014; 79 FR 64116, Oct. 28, 2014]