Skip to main content
Find a Lawyer

Code of Federal Regulations Title 21. Food and Drugs § 21.520.905c Fenbendazole paste

Current as of January 02, 2025 | Updated by Findlaw Staff

(a) Specifications. Each gram of paste contains 100 milligrams (mg) fenbendazole (10 percent).

(b) Sponsor. See No. 000061 in § 510.600(c) of this chapter.

(c) Related tolerances. See § 556.275 of this chapter.

(d) Special considerations. See § 500.25 of this chapter.

(e) Conditions of use—

(1) Horses—

(i) Indications for use and amounts—

(A) For control of large strongyles (Strongylus edentatus, S. equinus, S. vulgaris), small strongyles, pinworms (Oxyuris equi), and ascarids (Parascaris equorum):  2.3 mg per pound (/lb) of body weight, or for foals and weanlings (less than 18 months of age), 4.6 mg/lb of body weight. Retreatment at intervals of 6 to 8 weeks may be required.

(B) For control of arteritis caused by the fourth-stage larvae of S. vulgaris:  4.6 mg/lb of body weight daily for 5 days. Treatment should be initiated in the spring and repeated in 6 months.

(C) For treatment of encysted mucosal cyathostome (small strongyle) larvae including early third-stage (hypobiotic), late third-stage, and fourth-stage larvae:  4.6 mg/lb of body weight daily for 5 consecutive days.

(D) Fenbendazole paste 10 percent may be used concomitantly with approved forms of trichlorfon for the indications provided in paragraph (e)(1)(i)(A) of this section and for treating infections of stomach bots as provided in § 520.2520.

(ii) Limitations. Do not use in horses intended for human consumption.

(2) Cattle—

(i) Amount. 2.3 mg/lb of body weight. Retreatment may be needed after 4 to 6 weeks.

(ii) Indications for use. For the removal and control of lungworms (Dictyocaulus viviparus), stomach worms (Haemonchus contortus, Ostertagia ostertagi, Trichostrongylus axei), and intestinal worms (Bunostomum phlebotomum, Nematodirus helvetianus, Cooperia punctata, C. oncophora, Trichostrongylus colubriformis, and Oesophagostomum radiatum).

(iii) Limitations. Cattle must not be slaughtered within 8 days following last treatment. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal.

Previous Part of Code Next Part of Code
Back to Chapter List

Cite this article: FindLaw.com - Code of Federal Regulations Title 21. Food and Drugs § 21.520.905c Fenbendazole paste - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-21-food-and-drugs/cfr-sect-21-520-905c/

FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature before relying on it for your legal needs.

Was this helpful?

Welcome to FindLaw's Cases & Codes

A free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw’s Learn About the Law.

Go to Learn About the Law

Latest Blog Posts

For Legal Professionals

Learn About The Law

Get help with your legal needs

FindLaw’s Learn About the Law features thousands of informational articles to help you understand your options. And if you’re ready to hire an attorney, find one in your area who can help.

Go to Learn About the Law

Need to Find an Attorney?

Search our directory by legal issue

Enter information in one or both fields (Required)

Copied to clipboard