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Oral Dosage Form New Animal Drugs; Phenylbutazone Tablets and Boluses

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Information about this document as published in the Federal Register.

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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 First Priority, Inc. The supplemental application provides for revising the description of a 1-gram oral dosage form of phenylbutazone from tablet to bolus.


This rule is effective January 12, 2009.

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Melanie R. Berson, Center for Veterinary Medicine (HFV-110), Food and Drug Administration, 7500 Standish Pl., Rockville, MD 20855, 240-276-8337, e-mail:

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First Priority, Inc., 1585 Todd Farm Dr., Elgin, IL 60123, filed a supplement to NADA 48-647 for the veterinary prescription use of PRIBUTAZONE (phenylbutazone) Tablets in horses for the relief of inflammatory conditions associated with the musculoskeletal system. The supplemental application provides for revising the description of this 1-gram oral dosage form of phenylbutazone from tablet to bolus. The supplemental NADA is approved as of December 10, 2008, and 21 CFR 520.1720a is amended to reflect the approval.

Approval of this supplemental NADA did not require review of additional safety or effectiveness data or information. Therefore, a freedom of information summary is not required.

The agency has determined under 21 CFR 25.33(d)(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.

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List of Subjects in 21 CFR Part 520

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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,

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1. The authority citation for

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

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2. In § 520.1720a, revise paragraphs (a) and (b)(3); and add paragraph (b)(6) to read as follows:

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Phenylbutazone tablets and boluses.

(a) Specifications. Each tablet contains 100, 200, or 400 milligrams (mg), or 1 gram (g) of phenylbutazone. Each bolus contains 1, 2, or 4 gram g of phenylbutazone.

(b) * * *

(3) Nos. 000856 and 061623 for use of 100-mg or 1-g tablets in dogs and horses.

(6) No. 058829 for use of 100-mg or 1-g tablets in dogs and horses, or 1-g boluses in horses.

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Dated: January 5, 2009.

Steven D. Vaughn,

Director, Office of New Animal Drug Evaluation, Center for Veterinary Medicine.

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[FR Doc. E9-265 Filed 1-9-09; 8:45 am]