21 CFR § 524.463 - Copper naphthenate.

---
identifier: "/us/cfr/t21/s524.463"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 524.463 - Copper naphthenate."
title_number: 21
title_name: "Food and Drugs"
section_number: "524.463"
section_name: "Copper naphthenate."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "E"
subchapter_name: "ANIMAL DRUGS, FEEDS, AND RELATED PRODUCTS"
part_number: "524"
part_name: "OPHTHALMIC AND TOPICAL DOSAGE FORM NEW ANIMAL DRUGS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 360b."
regulatory_source: "40 FR 13873, Mar. 27, 1975, unless otherwise noted."
cfr_part: "524"
---


# 524.463 Copper naphthenate.

(a) *Amount.* The drug is a 37.5 percent solution of copper naphthenate.

(b) *Sponsors.* See Nos. 017135, 054771, and 058829 in § 510.600(c) of this chapter.

(c) *Conditions of use in horses*—(1) *Amount.* Apply daily to affected hooves until fully healed.

(2) *Indications for use.* As an aid in treating horses and ponies for thrush caused by organisms susceptible to copper naphthenate.

(3) *Limitations.* Use on horses and ponies only. Avoid contact around eyes. Do not contaminate feed. Do not use in horses intended for human consumption.

[47 FR 4250, Jan. 29, 1982, as amended at 68 FR 55825, Sept. 29, 2003; 71 FR 38074, July 5, 2006; 79 FR 10967, Feb. 27, 2014]