# Fenbendazole.
**AGENCY:**
Food and Drug Administration, HHS.
**ACTION:**
Final rule.
**SUMMARY:**
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 Intervet Inc. The supplemental NADA provides for use of a fenbendazole free choice, liquid Type C medicated feed in dairy and beef cattle for the removal and control of various internal parasites.
**DATES:**
This rule is effective October 8, 2008.
**FOR FURTHER INFORMATION CONTACT:**
Donald A. Prater, Center for Veterinary Medicine (HFV-130), Food and Drug Administration, 7500 Standish Pl., Rockville, MD 20855, 240-276-8343, e-mail: *[email protected]* .
**SUPPLEMENTARY INFORMATION:**
Intervet Inc., P.O. Box 318, 29160 Intervet Lane, Millsboro, DE 19966, filed a supplement to NADA 131-675 for SAFE-GUARD (fenbendazole) 20% Type A medicated article. The supplemental NADA provides for manufacture of a fenbendazole free choice, liquid Type C medicated feed for use in dairy and beef cattle for the removal and control of various internal parasites. The supplemental NADA is approved as of September 5, 2008, and the regulations are amended in 21 CFR 558.258 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 3 years of exclusivity apply only to the use of fenbendazole liquid Type C medicated feed for the removal and control of lungworms ( *Dictyocaulus viviparus* ), one of the parasite species for which the supplement is approved.
FDA has determined under 21 CFR 25.33(a) 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.
**List of Subjects in 21 CFR Part 558**
Animal drugs, Animal feeds.
**21 CFR Part 558**
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 558 is amended as follows:
**PART 558—NEW ANIMAL DRUGS FOR USE IN ANIMAL FEEDS**
**21 CFR Part 558**
1. The authority citation for 21 CFR part 558 continues to read as follows:
**Authority:**
21 U.S.C. 360b, 371.
**21 CFR Part 558**
2. In § 558.258, in the table in paragraph (e)(1), in the “Indications for use” column, remove “round worms” and in its place add “roundworms”; and revise paragraph (e)(3) to read as follows:
§ 558.258
(e) * * *
(3) Cattle.
| Amount fenbendazole | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- |
| (i) 5 mg/kg body weight (2.27 mg/lb) | Dairy and beef cattle: For the removal and control of: Lungworms (
); Stomach worms: barberpole worms (
), brown stomach worms (
), small stomach worms (
); Intestinal worms: hookworms (
), thread-necked intestinal worms (
), small intestinal worms (
and
); Bankrupt worms (
); and Nodular worms (
). | Feed as the sole ration or as a top dress for one day. Retreatment may be needed after 4 to 6 weeks. Cattle must not be slaughtered within 13 days following last treatment. For dairy cattle the milk discard time is zero hours. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. | 057926 |
| (ii) [Reserved] | | | |
(iii) * Free-choice feeds* —(A) *Amount* . 5 mg/kg body weight (2.27 mg/lb), including the following formulations:
| Ingredient | Percent | International Feed No. |
| --- | --- | --- |
| (
) Free-choice, dry Type C feed: | | |
| Salt (sodium chloride) | 59.00 | 6-04-152 |
| Monosodium phosphate | 31.16 | 6-04-288 |
| Dried cane molasses | 3.12 | 4-04-695 |
| Zinc sulfate | 0.76 | 6-05-556 |
| Copper sulfate | 0.45 | 6-01-720 |
| Fenbendazole 20% Type A article | 5.51 | n/a |
| (
) Free-choice, dry Type C feed: | | |
| Salt (sodium chloride) | 35.93 | 6-04-152 |
| Dicalcium phosphate (18.5% P) | 32.44 | 6-00-080 |
| Calcium carbonate (38% Ca) | 15.93 | 6-01-069 |
| Magnesium oxide (56% Mg) | 10.14 | 6-02-756 |
| Zinc sulfate | 1.47 | 6-05-556 |
| Mineral oil | 1.00 | 8-03-123 |
| Dried cane molasses (46% sugars) | 0.98 | 4-04-695 |
| Potassium iodide | 0.01 | 6-03-759 |
| Fenbendazole 20% Type A article | 2.10 | n/a |
| (
) Free-choice, liquid Type C feed: | | |
| Cane molasses | 80.902 | 4-13-251 |
| Water | 9.36 | n/a |
| Urea solution, 55% | 7.05 | 5-05-707 |
| Phosphoric acid 75% (feed grade) | 2.00 | 6-03-707 |
| Xantham gum | 0.20 | 8-15-818 |
| Trace minerals | 0.20 | n/a |
| Vitamin premix | 0.01 | n/a |
| Fenbendazole 20% Type A article | 0.278 | n/a |
(B) *Indications for use* . As in paragraph (e)(3)(i) of this section.
(C) *Limitations* . Feed a total of 5 mg of fenbendazole per kg (2.27 mg/lb) of body weight to cattle over a 3- to 6-day period. Retreatment may be needed after 4 to 6 weeks. Cattle must not be slaughtered within 13 days following last treatment. For dairy cattle the milk discard time is zero hours. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal.
Dated: September 29, 2008.
Bernadette Dunham,
Director, Center for Veterinary Medicine.