Skip to Content


Implantation or Injectable Dosage Form New Animal Drugs; Enrofloxacin

Document Details

Information about this document as published in the Federal Register.

Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble


Food and Drug Administration, HHS.


Final rule.


The Food and Drug Administration (FDA) is amending the animal drug regulations to reflect approval of a supplemental new animal drug application (NADA) filed by Bayer HealthCare, LLC. The supplemental NADA provides for the use of enrofloxacin injectable solution in female dairy cattle less than 20 months of age.


This rule is effective April 2, 2008.

Start Further Info


Joan C. Gotthardt, Center for Veterinary Medicine (HFV-130), Food and Drug Administration, 7500 Standish Pl., Rockville, MD 20855, 240-276-8342, e-mail:

End Further Info End Preamble Start Supplemental Information


Bayer HealthCare, LLC, Animal Health Division, P.O. Box 390, Shawnee Mission, KS 66201, filed a supplement to NADA 141-068 for BAYTRIL 100 (enrofloxacin) injectable solution used for the treatment of bovine respiratory disease associated with several bacterial pathogens. The supplemental NADA provides for the use of enrofloxacin injectable solution in female dairy cattle less than 20 months of age. The supplemental NADA is approved as of February 13, 2008, and the regulations in 21 CFR 522.812 are amended to reflect the approval.

In accordance with the freedom of information provisions of 21 CFR part 20 and 21 CFR 514.11(e)(2)(ii), a summary of safety and effectiveness data and information submitted to support approval of this application may be seen in the Division of Dockets Management (HFA-305), Food and Drug Administration, 5630 Fishers Lane, rm. 1061, Rockville, MD 20852, between 9 a.m. and 4 p.m., Monday through Friday.

Under section 512(c)(2)(F)(iii) of the Federal Food, Drug, and Cosmetic Act (21 U.S.C. 360b(c)(2)(F)(iii)), this supplemental approval qualifies for 3 years of marketing exclusivity beginning on the date of approval.

The agency has determined under 21 CFR 25.33(a)(1) that this action is of a type that does not individually or cumulatively have a significant effect on the human environment. Therefore, neither an environmental assessment nor an environmental impact statement is required.

This rule does not meet the definition of “rule” in 5 U.S.C. 804(3)(A) because it is a rule of “particular applicability.” Therefore, it is not subject to the congressional review requirements in 5 U.S.C. 801-808.

Start List of Subjects

List of Subjects in 21 CFR Part 522

End List of Subjects Start Amendment Part

Therefore, under the Federal Food, Drug, and Cosmetic Act and under authority delegated to the Commissioner of Food and Drugs and redelegated to the Center for Veterinary Medicine,

End Amendment Part Start Part


End Part Start Amendment Part

1. The authority citation for

End Amendment Part Start Authority

Authority: 21 U.S.C. 360b.

End Authority Start Amendment Part

2. In § 522.812, revise paragraphs (e)(2)(i) through (e)(2)(iii) to read as follows:

End Amendment Part

(e) * * *

(2) * * *

(i) Amount. Single-dose therapy: 7.5 to 12.5 mg/kg of body weight by subcutaneous injection. Multiple-day therapy: 2.5 to 5.0 mg/kg of body weight by subcutaneous injection. Treatment should be repeated at 24-hour intervals for 3 days. Additional treatments may be given on days 4 and 5 to animals that have shown clinical improvement but not total recovery.

(ii) Indications for use. For the treatment of bovine respiratory disease (BRD) associated with Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni (previously Haemophilus somnus) in beef and non-lactating dairy cattle.

(iii) Limitations. Animals intended for human consumption must not be slaughtered within 28 days from the last treatment. Do not use in female dairy cattle 20 months of age or older. Use of enrofloxacin in this class of cattle may cause milk residues. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal.

Start Signature

Dated: March 21, 2008.

Bernadette Dunham,

Director, Center for Veterinary Medicine.

End Signature End Supplemental Information

[FR Doc. E8-6706 Filed 4-1-08; 8:45 am]