Amprolium.
21 C.F.R. § 558.55
in effectEffective: 2024-07-01(a) Specifications. Type A medicated article containing 25 percent amprolium.
(b) Sponsor. No. 016592 in § 510.600(c) of this chapter.
(c) Related tolerances. See § 556.50 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.
(ii) [Reserved]
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-21.xmlFetched: 7/26/2026