21 CFR § 520.580Chapter I

§ 520.580 Dichlorophene and toluene.

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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 capsule contains 50 milligrams (mg) of dichlorophene and 60 mg of toluene, or multiples thereof.

Sponsors.(b) See sponsors in § 510.600(c) of this chapter for use as in paragraph (c) of this section:

(1) Nos. 017135 and 023851 for use only as a single dose.

(2) Nos. 000061, 054771, and 069043 for use in a single dose or divided-dosage regimen.

Required statement.(c) Consult your veterinarian for assistance in the diagnosis, treatment, and control of parasitism, and before administering to weak or debilitated animals.

Conditions of useAmount.(d) —(1) Administer as follows:

(i) Single dose: Administer 100 mg of dicholorophene and 120 mg of toluene per pound of body weight.

(ii) Divided dose: Administer 100 mg of dichlorophene and 120 mg of toluene per 5 pounds of body weight (20 and 24 mg per pound) daily for 6 days.

Indications for use.Toxocara canisToxascaris leoninaAncylostoma caninumUncinaria stenocephalaTaenia pisiformis, Dipylidium caninum,Echinococcus granulosus(2) For the removal of ascarids ( and ) and hookworms ( and ); and as an aid in removing tapeworms ( and ) from dogs and cats.

Limitations.(3) Withhold solid foods and milk for at least 12 hours prior to medication and for 4 hours afterward. Repeat treatment in 2 to 4 weeks in animals subject to reinfection.

[45 FR 10332, Feb. 15, 1980]

Editorial Note:Federal Registerwww.govinfo.gov.For citations affecting § 520.580, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at

eCFR data current as of: June 10, 2026

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.