---
kind: "section"
citation: "21 C.F.R. § 558.4"
title: "21"
number: "558.4"
heading: "Requirement of a medicated feed mill license."
url: "https://uscodex.org/cfr/21/558.4"
---

# §558.4. Requirement of a medicated feed mill license.

- (a) A feed manufacturing facility must possess a medicated feed mill license in order to manufacture a Type B or Type C medicated feed from a Category II, Type A medicated article.
- (b) The manufacture of the following types of feed are exempt from the required license, unless otherwise specified:
  - (1) Type B or Type C medicated feed using Category I, Type A medicated articles or Category I, Type B or Type C medicated feeds; and
  - (2) **Type B or Type C medicated feed using Category II, Type B or Type C medicated feeds.**
- (c) The use of Type B and Type C medicated feeds shall also conform to the conditions of use provided for in subpart B of this part.
- (d) This paragraph identifies each drug by category, the maximum level of drug in Type B medicated feeds, and the assay limits for the drug in Type A medicated articles and Type B and Type C medicated feeds, as follows:
- (e) When drugs from both categories are in combination, the Category II requirements will apply to the combination drug product.

## Notes

### Amendments

[51 FR 7392, Mar. 3, 1986]

### Authority

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

### Source

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

### Amendments

[51 FR 7392, Mar. 3, 1986]