21 CFR § 520.1310 - Marbofloxacin.

---
identifier: "/us/cfr/t21/s520.1310"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 520.1310 - Marbofloxacin."
title_number: 21
title_name: "Food and Drugs"
section_number: "520.1310"
section_name: "Marbofloxacin."
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"
---


# 520.1310 Marbofloxacin.

(a) *Specifications.* Each tablet or chewable tablet contains 25, 50, 100, or 200 milligrams (mg) marbofloxacin.

(b) *Sponsors.* See sponsors in § 510.600(c) of this chapter for use as in paragraph (d) of this section:

(1) Nos. 017033, 054771, and 086117 for use of tablets.

(2) No. 086101 for use of chewable tablets.

(c) [Reserved]

(d) *Conditions of use*—(1) *Amount.* 1.25 mg per pound (/lb) of body weight once daily, but may be increased to 2.5 mg/lb of body weight once daily.

(2) *Indications for use.* For the treatment of infections in dogs and cats associated with bacteria susceptible to marbofloxacin.

(3) *Limitations.* Federal law restricts this drug to use by or on the order of a licensed veterinarian. Federal law prohibits the extralabel use of this drug in food-producing animals.

[64 FR 39919, July 23, 1999, as amended at 66 FR 46369, Sept. 5, 2001; 78 FR 28823, May 20, 2014; 85 FR 45307, July 28, 2020; 88 FR 27698, May 3, 2023]