# Hoffmann-La Roche, Inc.; Chlortetracycline; Approval
> **Food and Drug Administration** · Final rule. · Published 1998-03-31 · Effective 1998-03-31 · 63 FR 15291
## Document
- **Document number:** 98-8126
- **Category:** other
- **Sub-agency:** Food and Drug Administration
- **Federal Register citation:** 63 FR 15291
- **CFR reference:** 21 CFR 558
- **Publication date:** 1998-03-31
- **Effective date:** 1998-03-31
## Abstract

The Food and Drug Administration (FDA) is approving two supplemental new animal drug applications (NADA's) filed by Hoffmann-La Roche, Inc. The supplemental NADA's provide for use of chlortetracycline (CTC) Type A medicated articles to make a Type C medicated feed and a calf milk replacer in compliance with the conclusions of the National Academy of Sciences/National Research Council (NAS/NRC) Drug Efficacy Study Implementation (DESI) review of the effectiveness of the drugs and FDA's conclusions based on that review. Approval of these supplemental NADA's does not require amendment of animal drug regulations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/03/31/98-8126/hoffmann-la-roche-inc-chlortetracycline-approval)
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