21 CFR § 520.1660b - Oxytetracycline capsules.

---
identifier: "/us/cfr/t21/s520.1660b"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.1660b - Oxytetracycline capsules."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.1660b"
section_name: "Oxytetracycline 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"
---


# 520.1660b Oxytetracycline capsules.

(a) *Specifications.* Each capsule contains 125 or 250 milligrams (mg) oxytetracycline hydrochloride.

(b) *Sponsor.* See No. 054771 in § 510.600(c) of this chapter.

(c) *Conditions of use in dogs and cats*—(1) *Amount.* Administer orally 25 to 50 mg per pound of body weight per day in divided doses at 12-hour intervals.

(2) *Indications for use.* For the treatment of bacterial pneumonia caused by *Brucella bronchiseptica,* tonsilitis caused by *Streptococcus hemolyticus,* bacterial enteritis caused by *Escherichia coli,* urinary tract infections caused by *Escherichia coli,* and wound infections caused by *Staphylococcus aureus.*

(3) *Limitations.* Federal law restricts this drug to use by or on the order of a licensed veterinarian.

[40 FR 13838, Mar. 27, 1975, as amended at 78 FR 28825, May 20, 2014; 88 FR 55563, Aug. 16, 2023]