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Oral Dosage Form New Animal Drugs; Moxidectin Gel

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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 Fort Dodge Animal Health, Division of Wyeth. The supplemental NADA provides for oral use of moxidectin gel in horses and ponies for the treatment and control of an additional species of small strongyle.


This rule is effective May 5, 2004.

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Melanie R. Berson, Center for Veterinary Medicine (HFV-110), Food and Drug Administration, 7500 Standish Pl., Rockville, MD 20855, 301-827-7543, e-mail:

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Fort Dodge Animal Health, Division of Wyeth, 800 Fifth St. NW., Fort Dodge, IA 50501, filed a supplement to NADA 141-087 for QUEST (moxidectin 2.0%) Gel, used for the treatment and control of various species of internal parasites in horses and ponies. The supplemental NADA provides for the addition of one new species of adult small strongyle and for the speciation of adult small strongyles in product labeling. The supplemental NADA is approved as of March 17, 2004, and 21 CFR 520.1452 is 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 approval qualifies for 3 years of marketing exclusivity beginning March 17, 2004. Exclusivity applies only to the new effectiveness claim for adult Coronocyclus labratus for which new data were 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

  • Animal drugs
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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, 21 CFR part 520 is amended as follows:

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1. The authority citation for 21 CFR part 520 continues to read as follows:

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

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2. Section 520.1452 is amended by revising the heading of paragraph (d) and by revising paragraph (d)(2) to read as follows:

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Moxidectin gel.

(d) Conditions of use in horses and ponies—* * *

(2) Indications for use. For the treatment and control of large strongyles: Strongylus vulgaris (adults and L4/L5 arterial stages), S. edentatus (adult and tissue stages), Triodontophorus brevicauda (adults), and T. serratus (adults); small strongyles (adults): Cyathostomum spp., including C. catinatum and C. pateratum; Cylicocyclus. spp., including C. insigne, C. leptostomum, and C. nassatus; Cyliocostephanus. spp., including C. calicatus, C. goldi, C. longibursatus, and C. minutus; Coronocyclus spp., including C. coronatus, C. labiatus, and C. labratus; and Gyalocephalus capitatus; small strongyles: undifferentiated lumenal larvae; encysted cyathostomes (late L3 and L4 mucosal cyathostome larvae); ascarids: Parascaris equorum (adults and L4 larval stages); pinworms: Oxyuris equi (adults and L4 larval stages); hairworms: Trichostrongylus axei (adults); large-mouth stomach worms: Habronema muscae (adults); and horse stomach bots: Gasterophilus intestinalis (2nd and 3rd instars) and G. nasalis (3rd instars). One dose also suppresses strongyle egg production for 84 days.

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Dated: April 14, 2004.

Steven D. Vaughn,

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

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[FR Doc. 04-10210 Filed 5-4-04; 8:45 am]