21 CFR § 520.1803 - Piperazine citrate capsules.

---
identifier: "/us/cfr/t21/s520.1803"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.1803 - Piperazine citrate capsules."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.1803"
section_name: "Piperazine citrate capsules."
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"
---


# 520.1803 Piperazine citrate capsules.

(a) *Specifications.* Each capsule contains piperazine citrate equivalent to 140 milligrams of piperazine base.

(b) *Sponsor.* See No. 021091 in § 510.600(c) of this chapter.

(c) *Conditions of use in dogs and cats*—(1) *Amount.* The contents of 1 capsule should be mixed with the food of the animal for each 5 pounds, or fraction thereof of body weight, except dogs weighing over 25 pounds should be given the contents of 6 capsules. The drug should be mixed in 1/2 of the regular feeding and when the animal has finished eating the dosed food, the remainder of the food may be given. Dogs and cats may be wormed at 6 to 8 weeks of age. The first treatment should be repeated 10 days later. Reinfection may occur. Repeat treatment if indicated.

(2) *Indications for use.* For the removal of large roundworms (*Toxocara canis* and *Toxascaris leonina*).

(3) *Limitations.* Severely debilitated animals should not be treated except on the advice of a veterinarian.

[40 FR 13838, Mar. 27, 1975, as amended at 54 FR 38515, Sept. 19, 1989; 78 FR 28826, May 20, 2014]