# New Animal Drugs for Use in Animal Feed; Zilpaterol; Technical Amendment
> **Food and Drug Administration** · Final rule; technical amendment. · Published 2008-04-08 · Effective 2008-04-08 · 73 FR 18958
## Document
- **Document number:** E8-7307
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 73 FR 18958
- **CFR reference:** 21 CFR 558
- **Publication date:** 2008-04-08
- **Effective date:** 2008-04-08
## Abstract

The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of a new animal drug application (NADA) filed by Intervet Inc. The NADA provides for use of approved, single-ingredient Type A medicated articles containing zilpaterol hydrochloride, monensin USP, tylosin phosphate, and melengestrol acetate in four-way combination Type B and Type C medicated feeds for heifers fed in confinement for slaughter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/04/08/E8-7307/new-animal-drugs-for-use-in-animal-feed-zilpaterol-technical-amendment)
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