21 CFR § 520.1156 - Imidacloprid.

---
identifier: "/us/cfr/t21/s520.1156"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.1156 - Imidacloprid."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.1156"
section_name: "Imidacloprid."
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"
---


# 520.1156 Imidacloprid.

(a) *Specifications.* Each chewable tablet contains 7.5 or 37.5 milligrams (mg) imidacloprid.

(b) *Sponsor.* See No. 058198 in § 510.600(c) of this chapter.

(c) *Conditions of use in dogs*—(1) *Amount.* Administer daily one 7.5-mg chewable tablet to dogs weighing 4 to 22 pounds (lb) or one 37.5-mg chewable table to dogs weighing 23 to 110 lb.

(2) *Indications for use.* Kills adult fleas and is indicated for the treatment of flea infestations on dogs and puppies 10 weeks of age and older and weighing 4 lb or greater.

(3) *Limitations.* Do not give to puppies younger than 10 weeks of age or to dogs weighing less than 4 lb. Do not give more than one tablet a day.

[80 FR 18775, Apr. 8, 2015, as amended at 86 FR 14818, Mar. 19, 2021]