---
kind: "section"
citation: "21 C.F.R. § 520.955"
title: "21"
number: "520.955"
heading: "Florfenicol."
url: "https://uscodex.org/cfr/21/520.955"
---

# §520.955. Florfenicol.

- (a) **Specifications.** Each milliliter (mL) contains 23 milligrams (mg) florfenicol.
- (b) **Sponsors.** See Nos. 000061, 054925, and 058198 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.283](/cfr/21/556.283.md) of this chapter.
- (d) **Conditions of use in swine—**
  - (1) **Amount.** Administer in drinking water ad libitum at 400 mg per gallon (100 parts per million (ppm)) for 5 consecutive days.
  - (2) **Indications for use.** For the treatment of swine respiratory disease (SRD) associated with Actinobacillus pleuropneumoniae, Pasteurella multocida, Salmonella choleraesuis and Streptococcus suis.
  - (3) **Limitations.** Do not slaughter within 16 days of last treatment. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

## Notes

### Amendments

[67 FR 78357, Dec. 24, 2002, as amended at 72 FR 262, Jan. 4, 2007; 78 FR 52854, Aug. 27, 2013; 82 FR 12169, Mar. 1, 2017]

### Authority

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

### Source

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

### Amendments

[67 FR 78357, Dec. 24, 2002, as amended at 72 FR 262, Jan. 4, 2007; 78 FR 52854, Aug. 27, 2013; 82 FR 12169, Mar. 1, 2017]