---
kind: "section"
citation: "21 C.F.R. § 558.366"
title: "21"
number: "558.366"
heading: "Nicarbazin."
url: "https://uscodex.org/cfr/21/558.366"
---

# §558.366. Nicarbazin.

- (a) **Specifications.** Type A medicated articles containing 25 percent nicarbazin.
- (b) **Sponsors.** See Nos. 060728, 066104, and 069254 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.445](/cfr/21/556.445.md) of this chapter.
- (d) **Conditions of use.** It is used as follows:
  - (1) **Chickens—**
  - (2) Nicarbazin single-ingredient Type A medicated articles may also be used in combination with:
    - (i) [Reserved]
    - (ii) Virginiamycin as in [§ 558.635](/cfr/21/558.635.md).

## Notes

### Amendments

[83 FR 64743, Dec. 18, 2018, as amended at 86 FR 14825, Mar. 19, 2021; 88 FR 14907, Mar. 10, 2023; 88 FR 55570, Aug. 16, 2023]

### Authority

Authority: 21 U.S.C. 354, 360b, 360ccc, 360ccc-1, 371.

### Source

Source: 40 FR 13959, Mar. 27, 1975, unless otherwise noted.

### Amendments

[83 FR 64743, Dec. 18, 2018, as amended at 86 FR 14825, Mar. 19, 2021; 88 FR 14907, Mar. 10, 2023; 88 FR 55570, Aug. 16, 2023]