Why NeoPolyBac shouldn’t be the default for every red eye

A simple prescribing habit is getting a needed check: veterinary ophthalmologists are urging clinicians not to use NeoPolyBac as the default answer for every red eye. In a Cone of Shame discussion focused on the red-eyed dog, Dr. Alex Sigmund told Dr. Andy Roark that bacterial conjunctivitis is uncommon in dogs, and that many patients treated empirically with triple-antibiotic ointment actually have a different primary problem. His takeaway was clear: diagnose the cause first, and reserve topical antibiotics for cases that truly need them, especially corneal ulcers. (drandyroark.com)

That message lands in a familiar clinical setting. “Red eye” is one of the most common ophthalmic complaints in small animal practice, but it’s a clinical sign, not a diagnosis. Ophthalmology references for general practitioners note that canine red eye can reflect keratoconjunctivitis sicca, corneal ulceration, uveitis, glaucoma, eyelid disease, foreign material, or orbital disease, among other causes. The University of Illinois veterinary ophthalmology service similarly notes that conjunctivitis in dogs is rarely caused by a surface infection, making routine topical antibiotic therapy rarely indicated. (todaysveterinarypractice.com)

The distinction matters because NeoPolyBac is still a legitimate drug, just not a universal one. Federal regulation lists bacitracin, neomycin, and polymyxin B ophthalmic ointment for treatment of superficial bacterial infections of the eyelid and conjunctiva in dogs and cats when due to susceptible organisms. Product labeling for the human-labeled equivalent also describes use for superficial external ocular infections caused by susceptible bacteria, but warns that ophthalmic ointments may retard corneal wound healing, that hypersensitivity can occur, and that prolonged use may select for nonsusceptible organisms, including fungi. (law.cornell.edu)

At the same time, ophthalmology guidance does support triple-antibiotic ointment in a narrower role. Today’s Veterinary Practice notes that uncomplicated superficial corneal ulcers are typically managed with pain control, treatment of underlying disease, and a topical broad-spectrum antibiotic such as neomycin, bacitracin, and polymyxin B to prevent infection; it also stresses that these drugs do not themselves speed healing and that patients should be evaluated for concurrent disease such as KCS. The same source recommends cytology, and in deeper or melting ulcers, escalation to more intensive therapy, including fluoroquinolones and culture-guided treatment when indicated. (todaysveterinarypractice.com)

The broader professional backdrop is antimicrobial stewardship. The 2022 AAFP/AAHA Antimicrobial Stewardship Guidelines define stewardship as conscientious oversight and responsible decision-making to preserve antimicrobial effectiveness, and AAHA has highlighted ophthalmology specifically as an area where red eyes are still often treated with antibiotics despite noninfectious causes such as allergies, dry eye, uveitis, or glaucoma. In that context, Sigmund’s “less is more” framing fits a larger push across companion animal medicine to match antimicrobial use to diagnosis rather than habit. (aaha.org)

Why it matters: For general practitioners and technicians, this is a practical reminder to slow down the red-eye workup. A Schirmer tear test, fluorescein stain, and tonometry can change the case from “probably conjunctivitis” to KCS, ulcer, or glaucoma, each with very different urgency and treatment implications. Overusing NeoPolyBac risks missing the actual disease process, delaying referral, and adding unnecessary antimicrobial exposure, while underusing it in true ulcer or superficial bacterial cases can also be a problem. The clinical opportunity is better triage: identify which eyes need targeted topical antibiotics, which need lubrication or anti-inflammatory care, and which need same-day ophthalmology escalation. (vetmed.illinois.edu)

There’s also a communication angle for teams working with pet parents. When a red eye looks “infected,” declining to prescribe an antibiotic can feel counterintuitive unless the team explains that redness and discharge are signs shared by many ocular diseases, not proof of bacterial infection. AAHA stewardship materials explicitly note that the whole veterinary team has a role in explaining why antibiotics may not be the best option for some conditions. That makes this less of a drug story than a diagnostic-discipline story. (aaha.org)

What to watch: Expect more specialty-led education on antibiotic-sparing ophthalmology, more pressure to justify empiric topical antibiotic use, and continued discussion of when primary care teams should refer persistent or painful red-eye cases rather than simply changing drops after the first ointment fails. (onlinelibrary.wiley.com)