21 CFR 520.2520c
§ 520.2520c Trichlorfon granules.
United States · 21 CFR — Food and Drugs · Status: effective
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- Citation
- 21 CFR 520.2520c, § 520.2520c Trichlorfon granules, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/87363
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Full text
(a) Specifications. Each package contains either 18.2 or 36.4 g of trichlorfon.
(b) Sponsor. See No. 054771 in § 510.600(c) of this chapter.
(c) Conditions of use in horses—(1) Amount. 18.2 milligrams per pound of body weight.
(2) Indications for use. For horses for removal of bots (Gastrophilus nasalis, Gastrophilus intestinalis), 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.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.