---
kind: "section"
citation: "21 C.F.R. § 556.226"
title: "21"
number: "556.226"
heading: "Enrofloxacin."
url: "https://uscodex.org/cfr/21/556.226"
---

# §556.226. Enrofloxacin.

- (a) **Acceptable daily intake (ADI).** The ADI for total residue of enrofloxacin is 3 µg/kg of body weight per day.
- (b) **Tolerances.** The tolerances for enrofloxacin are:
  - (1) **Cattle.** Liver (target tissue): 0.1 ppm desethylene ciprofloxacin (marker residue).
  - (2) **Swine.** Liver (target tissue): 0.5 ppm enrofloxacin (marker residue).
- (c) **Related conditions of use.** See §§ [516.812](/cfr/21/516.812.md) and [522.812](/cfr/21/522.812.md) of this chapter.

## Notes

### Amendments

[84 FR 32993, July 11, 2019, as amended at 86 FR 13188, Mar. 8, 2021]

### Authority

Authority: 21 U.S.C. 342, 360b, 371.

### Source

Source: 84 FR 32993, July 11, 2019, unless otherwise noted.

### Amendments

[84 FR 32993, July 11, 2019, as amended at 86 FR 13188, Mar. 8, 2021]