Amprolium and ethopabate.
21 C.F.R. § 558.58
in effectEffective: 2024-07-01(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) of this chapter.
(c) Related tolerances. See §§ 556.50 and 556.260 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.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026