21 CFR § 520.2520cChapter I

§ 520.2520c Trichlorfon granules.

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Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.

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Specifications.(a) Each package contains either 18.2 or 36.4 g of trichlorfon.

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

Conditions of use in horsesAmount.(c) —(1) 18.2 milligrams per pound of body weight.

Indications for use.Gastrophilus nasalis, Gastrophilus intestinalisParascaris equorumOxyuris equi(2) For horses for removal of bots (), large roundworms (ascarids, ), and pinworms ().

Limitations.(3) 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.

[45 FR 48128, July 18, 1980. Redesignated and amended at 79 FR 28833, May 20, 2014]

eCFR data current as of: June 10, 2026

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