21 CFR § 524.155 - Bacitracin, neomycin, polymyxin B, and hydrocortisone ophthalmic ointment.
---
identifier: "/us/cfr/t21/s524.155"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 524.155 - Bacitracin, neomycin, polymyxin B, and hydrocortisone ophthalmic ointment."
title_number: 21
title_name: "Food and Drugs"
section_number: "524.155"
section_name: "Bacitracin, neomycin, polymyxin B, and hydrocortisone ophthalmic ointment."
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: "524"
part_name: "OPHTHALMIC AND TOPICAL 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 13873, Mar. 27, 1975, unless otherwise noted."
cfr_part: "524"
---
# 524.155 Bacitracin, neomycin, polymyxin B, and hydrocortisone ophthalmic ointment.
(a) *Specifications.* Each gram of ointment contains 400 units of bacitracin zinc, 5 milligrams (mg) of neomycin sulfate (equivalent to 3.5 mg of neomycin sulfate), 10,000 units of polymyxin B sulfate, and10 mg of hydrocortisone.
(b) *Sponsors.* See Nos. 000061 and 043264 in § 510.600(c) of this chapter.
(c) *Conditions of use in dogs and cats*—(1) *Amount.* Apply a thin film over the cornea three or four times daily.
(2) *Indications for use.* For treating acute or chronic conjunctivitis caused by susceptible organisms.
(3) *Limitations.* Federal law restricts this drug to use by or on the order of a licensed veterinarian.
[57 FR 37333, Aug. 18, 1992, as amended at 61 FR 8873, Mar. 6, 1996; 62 FR 61626, Nov. 19, 1997; 77 FR 64717, Oct. 23, 2012; 79 FR 10967, Feb. 27, 2014]