---
kind: "section"
citation: "21 C.F.R. § 558.58"
title: "21"
number: "558.58"
heading: "Amprolium and ethopabate."
url: "https://uscodex.org/cfr/21/558.58"
---

# §558.58. Amprolium and ethopabate.

- (a) **Specifications.** Type A medicated articles containing:
  - (1) 25 percent amprolium and 8 percent ethopabate or 5 percent amprolium and 1.6 percent ethopabate;
  - (2) 25 percent amprolium and 0.8 percent ethopabate or 5 percent amprolium and 0.16 percent ethopabate.
- (b) **Sponsor.** See 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) and [556.260](/cfr/21/556.260.md) of this chapter.
- (d) **Special considerations.** Do not use in Type B or Type C medicated feeds containing bentonite.
- (e) **Conditions of use.** It is used in chicken feed as follows:
- (f) Amprolium and ethopabate may also be used in combination with:
  - (1) -(2) [Reserved]
  - (3) Chlortetracycline as in [§ 558.128](/cfr/21/558.128.md).

## Notes

### Amendments

[41 FR 10990, 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 10990, Mar. 15, 1976]