21 CFR § 520.2045 - Pyrantel tartrate powder.

---
identifier: "/us/cfr/t21/s520.2045"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.2045 - Pyrantel tartrate powder."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.2045"
section_name: "Pyrantel tartrate powder."
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"
---


# 520.2045 Pyrantel tartrate powder.

(a) *Specifications.* Each gram of powder contains 106 milligrams (10.6 percent) or 113 milligrams (11.3 percent) pyrantel tartrate.

(b) *Sponsor.* See No. 054771 in § 510.600(c) of this chapter for use of 11.3 percent powder as in paragraph (d)(1) and 10.6 percent powder as in paragraph (d)(2) and of this section.

(c) *Related tolerances.* See § 556.560 of this chapter.

(d) *Conditions of use*—(1) *Horses*—(i) *Amount.* Administer as a single dose at 0.57 gram of pyrantel tartrate per 100 pounds of body weight mixed with the usual grain ration. Do not administer by stomach tube or dose syringe.

(ii) *Indications for use.* For the removal and control of infections from the following mature parasites: Large strongyles (*Strongylus vulgaris, S. edentatus,* *S. equinus*), small strongyles (*Trichonema* spp., *Triodontophorus*), pinworms (*Oxyuris*), and large roundworms (*Parascaris*).

(iii) *Limitations.* Do not treat severely debilitated animals with this drug. Do not use in horses intended for human consumption.

(2) *Swine*—(i) *Amount.* Add to feed at 0.4 gram pyrantel tartrate per pound of non-pelleted ration. The ration is administered as a single treatment as the sole ration at the rate of 1 pound per 40 pounds of animal weight for animals up to 200 pounds. Animals 200 pounds and over are administered 5 pounds of ration per animal.

(ii) *Indications for use.* For the removal and control of large roundworms (*Ascaris suum*) and nodular worm (*Oesophagostomum*) infections.

(iii) *Limitations.* Consult veterinarian before using in severely debilitated animals. Do not treat within 24 hours of slaughter.

[79 FR 28827, May 20, 2014]