---
kind: "section"
citation: "21 C.F.R. § 558.55"
title: "21"
number: "558.55"
heading: "Amprolium."
url: "https://uscodex.org/cfr/21/558.55"
---

# §558.55. Amprolium.

- (a) **Specifications.** Type A medicated article containing 25 percent amprolium.
- (b) **Sponsor.** No. 016592 in [§ 510.600(c)](/cfr/21/510.600.md?p=c) of this chapter.
- (c) **Related tolerances.** See [§ 556.50](/cfr/21/556.50.md) of this chapter.
- (d) **Special considerations.** Do not use in Type B or Type C medicated feeds containing bentonite.
- (e) **Conditions of use—**
  - (1) **Cattle.** It is used as follows:
  - (2) **Chickens.** It is used as follows:
  - (3) **Turkeys.** It is used as follows:
  - (4) **Pheasants.** It is used as follows:
  - (5) **Permitted combinations.** Amprolium may also be used in combination with:
    - (i) Virginiamycin as in [§ 558.635](/cfr/21/558.635.md).
    - (ii) [Reserved]

## Notes

### Amendments

[41 FR 10985, Mar. 15, 1976]

### Authority

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

### Source

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

### Amendments

[41 FR 10985, Mar. 15, 1976]