Conjunctivitis in birds is inflammation of the membrane around the eye, and it shows up as redness, swelling, discharge or a bird that keeps rubbing its face on the perch.
Where a bacterial component is suspected, keepers sometimes ask about oxytetracycline products such as Terramycin Eye Ointment, or about azithromycin such as Fish Zithro, but these are labelled for ornamental fish and pet birds only and the label on the bottle is the only place a dose should ever come from.
Before assuming infection, check the basics: poor ventilation, ammonia build-up in a closed cage, dusty loft litter, overcrowding and stale drinking water explain a large share of eye and respiratory signs in birds.
This article covers the signs of conjunctivitis, the conditions that mimic it, where the tetracycline and macrolide classes sit, and why an avian veterinarian should identify the organism before any antibacterial is used.
What Conjunctivitis in Birds Actually Looks Like
The conjunctiva is the thin membrane lining the eyelids and covering the white of the eye. When it is inflamed, the eye looks wet, pink or puffy, and there may be a watery or thicker discharge at the corner. A bird may blink more often, hold one eye partly closed, or scratch at the eye with a foot.
In pigeons and doves, fanciers often notice a single weepy eye first, sometimes with a slight swelling of the eyelid. In parrots and small companion birds, the signs can be subtler: a ruffled bird sitting low, a change in appetite, or a reluctance to come out of the cage. Because birds hide illness until late, an eye that looks obviously sore usually means the bird has been unwell for some time.
Conjunctivitis itself is a description, not a diagnosis. The cause may be bacterial, viral, fungal, parasitic, environmental or a combination, and only a veterinarian can identify the organism involved. A bird with an eye sign should be seen promptly rather than treated on guesswork.
Husbandry First: Loft, Cage and Air Quality
For fish keepers we say water quality first; for bird keepers the equivalent is air and hygiene. Ammonia from droppings, dust from seed and litter, poor ventilation in a closed loft or a cage placed near a kitchen or aerosol spray all irritate the eye and respiratory tract. Crowding increases contact spread and stress.
Fresh drinking water changed at least daily, dry perches, regular removal of droppings and a draught-free but well-ventilated space do more for eye health than any bottle on a shelf. New arrivals should be quarantined away from the main flock, and our quarantine guide sets out the principles even though it is written with fish in mind.
If several birds in a loft show eye signs at once, stop and look at the environment before assuming a single infection. Outbreaks that follow a change in bedding, a new batch of birds or a spell of damp weather are common, and correcting the husbandry is the first step.
Conditions That Can Mimic or Accompany Conjunctivitis
A weepy eye is rarely an isolated event. Respiratory infection, air sac infection and sinusitis often sit behind it, because the tear ducts and sinuses connect. Our articles on eye infection in birds and respiratory infection in birds describe how these presentations overlap.
Chlamydiosis, sometimes called psittacosis, is a bacterial infection that can cause conjunctivitis and respiratory signs in birds and is transmissible to people. It is a zoonosis. If a bird has a persistent eye or breathing problem and a keeper develops flu-like symptoms, both need professional advice, and the bird should not be handled without care until a veterinarian has assessed it.
Mycoplasma, poxvirus, nutritional deficiencies, foreign bodies such as a seed husk or feather fragment, and irritant fumes can all produce a red or weeping eye. Some of these need completely different management, which is why guessing wastes time.
Where Tetracyclines and Macrolides Sit
Two antibacterial classes are often discussed for eye and respiratory signs in birds. The tetracyclines, including oxytetracycline, are broad-spectrum agents that interfere with bacterial protein synthesis. Terramycin Eye Ointment is an oxytetracycline product in a 3.5 g tube, labelled for ornamental fish and pet birds.
The macrolides, including azithromycin, work by a different mechanism and are often considered where certain intracellular or atypical organisms are suspected. Fish Zithro is an azithromycin product supplied in 12 and 30 count bottles, again labelled for ornamental fish and pet birds.
Neither class is a first-line guess. The choice depends on the organism, the site of infection and the species, and that is a veterinary decision. Our antibacterial classes guide explains the families in more detail, and the treatment guide points back to the label for any product you already hold.
Fish Mox, our amoxicillin line, is the store's flagship and is often the first name people search for, but amoxicillin is a penicillin-class antibacterial with its own spectrum and its own label. It is not a universal answer to an eye problem, and it is not for food-producing birds.
Why the Label and the Vet Come Before the Bottle
Every antibacterial we sell carries a label written for a specific species group and a specific set of instructions. That label is the only place a dose, a frequency or a course length should come from. We do not publish figures here, and we would not want a keeper to invent one.
Antimicrobial stewardship matters in birds as much as in any other animal. Using an antibacterial when the cause is viral, environmental or mechanical does nothing for the bird and encourages resistance that makes future treatment harder. Treat only when a veterinarian has identified a reason, follow the label exactly, and finish the course as directed.
Our legal and regulatory page explains the framework these products sit in, and the FAQ answers common questions about ordering and use. The bird antibiotics collection lists what is currently available for ornamental fish and pet birds.
Quarantine, Hygiene and Reducing Spread
If one bird in a loft or aviary has a weepy eye, separate it from the flock while you arrange veterinary advice. Use separate feed and water containers, handle the affected bird last, and wash your hands thoroughly afterwards. Chlamydiosis is a zoonosis, so this is not only about the birds.
Keep a simple record: when the sign started, which eye, whether there is discharge, whether the bird is eating and breathing normally, and any recent changes to the loft. A veterinarian can work much faster with that information.
New birds should be quarantined before joining the flock, and equipment should not be shared between quarantine and main areas without cleaning. These steps cost nothing and prevent a great deal.
When to Call an Avian Veterinarian
Call promptly if a bird has a swollen or closed eye, discharge, laboured breathing, a change in droppings, or is sitting fluffed and quiet. Birds mask illness, so obvious signs mean the bird is often already seriously unwell.
A veterinarian can examine the eye, sample any discharge, and identify whether bacteria, virus, fungus, parasites or environment are involved. That is the only reliable basis for choosing an antibacterial, and it is the only way to know whether one is needed at all.
If you already hold a product such as Terramycin Eye Ointment or Fish Zithro, do not start it on your own initiative. Take it with you to the appointment and let the veterinarian decide whether it is appropriate for the species and the problem.
| Sign | What it can indicate | First step |
|---|---|---|
| Watery eye, blinking | Irritation, early conjunctivitis, dust or ammonia | Check ventilation and litter; observe |
| Swollen eyelid, discharge | Bacterial or viral infection, foreign body | Isolate and contact an avian vet |
| One eye only, rubbing | Foreign body, injury, early local infection | Inspect gently; vet if it persists |
| Both eyes, respiratory noise | Respiratory or air sac involvement, chlamydiosis | Vet promptly; zoonosis risk |
| Fluffed bird, not eating | Systemic illness, bird already seriously unwell | Urgent avian veterinary advice |
Common eye signs in birds and what they can indicate
Frequently asked questions
Is conjunctivitis in birds contagious to other birds?
It depends on the cause. Bacterial and viral causes can spread between birds in a crowded loft, while environmental irritation does not. Isolating the affected bird and improving ventilation reduces the risk while you wait for veterinary advice.
Can I use Terramycin Eye Ointment on my pigeon's eye?
Terramycin Eye Ointment is labelled for ornamental fish and pet birds, and pigeons kept as pets or racers fall within that. However, the decision to use it should follow a veterinary assessment, and the label on the tube is the only source of instructions. Do not use it on poultry or any bird kept for eggs or meat.
Is Fish Zithro suitable for a bird with a weepy eye?
Fish Zithro is an azithromycin product labelled for ornamental fish and pet birds. Whether it is appropriate for a particular eye problem depends on the organism involved, which only a veterinarian can identify. Never use it in food-producing birds.
What is the dose for these products in birds?
We do not publish doses. The label on the bottle is the only place a dose, frequency or course length should come from, and an avian veterinarian should confirm the product is right for your bird. Guessing a dose can harm the bird and undermines stewardship.
Can conjunctivitis in birds spread to people?
Some causes can. Chlamydiosis, also called psittacosis, is a zoonosis and can cause flu-like illness in people. If your bird has a persistent eye or respiratory problem and you feel unwell, seek medical advice for yourself and veterinary advice for the bird.
Does Fish Mox treat eye infections in birds?
Fish Mox is our amoxicillin line, labelled for ornamental fish and pet birds. Amoxicillin is not a universal treatment for eye problems, and it should only be used when a veterinarian has identified a bacterial cause that it covers. Follow the label and finish the course as directed.
My Fish Mox supplies Aqua Soma Labs antibacterials for ornamental fish and pet birds: one named active per bottle, factory-sealed, with the lot code and expiry printed on the label, dispatched the same business day. See the full range.
For aquarium and avian use only. This article is general husbandry information, not veterinary advice and not a dosing instruction. These products are not for human consumption and not for animals raised for food. Follow the label on the bottle, and consult an aquatic or avian veterinarian, who can identify the organism and advise on the correct product, dose and duration. See our legal and regulatory information.