CFR - Code of Federal Regulations Title 21

The information on this page is current as of Mar 22, 2024.

For the most up-to-date version of CFR Title 21, go to the Electronic Code of Federal Regulations (eCFR).

[Code of Federal Regulations]

[Title 21, Volume 6]

[CITE: 21CFR520.2520d]

TITLE 21--FOOD AND DRUGS

CHAPTER I--FOOD AND DRUG ADMINISTRATION
DEPARTMENT OF HEALTH AND HUMAN SERVICES

SUBCHAPTER E - ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS

PART 520 -- ORAL DOSAGE FORM NEW ANIMAL DRUGS

Sec. 520.2520d Trichlorfon, phenothiazine, and piperazine.

(a) Specifications. Each 54.10 grams (1.91 ounces) of water dispersible powder contains 9.10 grams of trichlorfon, 6.25 grams of phenothiazine, and the equivalent of 20.0 grams of piperazine base (as piperazine dihydrochloride).

(b) Sponsor. See No. 054771 in § 510.600(c) of this chapter.

(c) Conditions of use in horses - (1) Amount. 18.2 milligrams (mg) of trichlorfon, 12.5 mg of phenothiazine, and 40 mg of piperazine base per pound of body weight.

(2) Indications for use. For removal of bots (Gastrophilus nasalis, Gastrophilus intestinalis ), large strongyles (Strongylus vulgaris ), small strongyles, large roundworms (ascarids, Parascaris equorum ), and pinworms (Oxyuris equi ).

(3) Limitations. Do not use in horses intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian.

[48 FR 2757, Jan. 21, 1983. Redesignated and amended at 79 FR 28833, May 20, 2014; 85 FR 4208, Jan. 24, 2020]

Editorial Note:

At 79 FR 28833, May 20, 2014, § 520.2520d was amended in part by redesignating paragraph (e) as (c). This action could not be performed because paragraph (e) did not exist.