21 CFR § 520.1806 - Piperazine suspension.

---
identifier: "/us/cfr/t21/s520.1806"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.1806 - Piperazine suspension."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.1806"
section_name: "Piperazine suspension."
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: "520"
part_name: "ORAL 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 13838, Mar. 27, 1975, unless otherwise noted."
cfr_part: "520"
---


# 520.1806 Piperazine suspension.

(a) *Specifications.* Each milliliter of suspension contains piperazine monohydrochloride equivalent to 33.5 milligrams (mg) piperazine base.

(b) *Sponsor.* See No. 017135 in § 510.600(c) of this chapter.

(c) *Special considerations.* See § 500.25(c) of this chapter.

(d) *Conditions of use in dogs*—(1) *Indications for use.* For the removal of roundworms (*Toxocara canis*and *Toxascaris leonina*).

(2) *Dosage.* Administer 20 to 30 mg piperazine base per pound body weight as a single dose.

(3) *Limitations.* Administer by mixing into the animal's ration to be consumed at one feeding. For animals in heavily contaminated areas, reworm at monthly intervals. Not for use in unweaned pups or animals less than 3 weeks of age.

[70 FR 17319, Apr. 6, 2005]