---
kind: "section"
citation: "21 C.F.R. § 520.2215"
title: "21"
number: "520.2215"
heading: "Sulfadiazine/pyrimethamine suspension."
url: "https://uscodex.org/cfr/21/520.2215"
---

# §520.2215. Sulfadiazine/pyrimethamine suspension.

- (a) **Specifications.** Each milliliter (mL) of suspension contains 250 milligrams (mg) sulfadiazine (as the sodium salt) and 12.5 mg pyrimethamine.
- (b) **Sponsor.** See No. 055246 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Conditions of use in horses—**
  - (1) **Amount.** Administer orally 20 mg sulfadiazine per kilogram (kg) body weight and 1 mg/kg pyrimethamine daily.
  - (2) **Indications for use.** For the treatment of equine protozoal myeloencephalitis (EPM) caused by Sarcocystis neurona.
  - (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

[69 FR 70054, Dec. 2, 2004, as amended at 73 FR 53686, Sept. 17, 2008; 75 FR 69586, Nov. 15, 2010]

### Authority

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

### Source

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

### Amendments

[69 FR 70054, Dec. 2, 2004, as amended at 73 FR 53686, Sept. 17, 2008; 75 FR 69586, Nov. 15, 2010]