# New Animal Drugs for Use in Animal Feeds; Roxarsone; Semduramycin
> **Food and Drug Administration** · Final rule; technical amendment. · Published 2005-07-21 · Effective 2005-07-21 · 70 FR 41958
## Document
- **Document number:** 05-14329
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 70 FR 41958
- **CFR reference:** 21 CFR 558
- **Publication date:** 2005-07-21
- **Effective date:** 2005-07-21
## Abstract

The Food and Drug Administration (FDA) is correcting the single-ingredient roxarsone Type A medicated article that may be used to formulate three-way, combination drug Type C medicated broiler chicken feeds containing semduramicin, virginiamycin, and roxarsone under a new animal drug application (NADA) recently approved for Phibro Animal Health. FDA is also amending the animal drug regulations to reflect two roxarsone Type A medicated articles approved under separate new animal drug applications (NADAs) for different conditions of use. This action is being taken to improve the accuracy of the agency's regulations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/07/21/05-14329/new-animal-drugs-for-use-in-animal-feeds-roxarsone-semduramycin)
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