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Antibiotic Eye Drops for Dogs

By the Dog Health Handbook team · Updated · Fact-checked against current veterinary references (see sources)

Key takeaways

  • Antibiotic eye drops treat bacterial infection and protect scratches and ulcers from infection.
  • True bacterial conjunctivitis is rare in dogs; most cases come from dry eye, allergies or eyelid problems.
  • In the US, antibiotic eye products for animals need a prescription as of June 2023.
  • Antibiotic-steroid combinations can make an ulcer much worse.
  • Eye infections that keep coming back usually have a cause that antibiotics alone won't fix.

Table of Contents

Research What they treat Not always infection Over the counter? Using them Resistance FAQ Sources

Dog Eye Quicklinks

Eye Problems Red Eyes Watery Eyes Dry Eye Swollen Eyes Eye Injuries Eye Infections Eye Discharge Conjunctivitis Eye Drops Eye Wash Eye Tumors Eye Surgery

Antibiotic eye drops and ointments treat bacterial infections of the eye's surface. They also protect a scratch or corneal ulcer from becoming infected while it heals.1,2 But most red, goopy eyes in dogs aren't caused by bacteria to begin with. Eye specialists say that true bacterial conjunctivitis is rare in dogs. When bacteria are involved, it's usually because of another problem underneath, such as dry eye, allergies or an eyelid problem.3,4 That's why antibiotics alone often don't fix an eye for good.

See your vet the same day if your dog:

  • Is squinting, holding the eye shut or pawing at it5,2
  • Has a cloudy, bluish or white spot on the eye2,6
  • Has thick discharge with redness that's getting worse, or a swollen eye5

Eye infections and ulcers can get worse fast, so most red or goopy eyes should be seen within a day.5

What the Research Says

  • Resistance is rising. In 198 samples from dogs with deep corneal ulcers in Iowa, bacteria grew in 80%. Almost half of the staph bacteria (49%) were methicillin-resistant, and resistance rose significantly from 2018 to 2021.7
  • Healthy eyes carry bacteria too. In one study, bacteria grew from about 3 out of 4 healthy dog eyes, so finding bacteria doesn't by itself prove an infection.8
  • Preventive drops haven't been tested. A 2021 evidence review found no studies testing whether antibiotic drops actually prevent infection in simple corneal ulcers, although vets routinely use them.9
  • The gel may matter as much as the drug. One UK eye specialist noted that a popular antibiotic eye gel works as well on non-infected conjunctivitis, probably because its base soothes and lubricates the eye.10

What Antibiotic Eye Drops Treat

  • Corneal scratches and ulcers: to stop infection while they heal. Simple ulcers often heal in 3 to 5 days.2,1 See corneal ulcers.
  • Infected ulcers: these need intensive treatment, often with a culture to pick the right antibiotic. Some bacteria can quickly "melt" the cornea.1,11
  • Bacterial conjunctivitis and eyelid infections, usually alongside treatment of the underlying cause.3,12 See eye infections in dogs.
  • After eye surgery, such as cataract or eyelid surgery.13,14

Drops wash out quickly and are given more often. Ointments last longer and are easier to give some dogs, but drops are preferred if a deep ulcer might rupture.2,15,11 For infections of the eyelids, the inside of the eye or behind it, vets also use oral antibiotics.1

Why Many "Eye Infections" Aren't Bacterial

Green or yellow discharge can mean infection, but in dogs it's often caused by dry eye or allergies, which antibiotics alone won't fix.3,4,16 Common causes of red, goopy eyes include:

  • Dry eye, the most common cause of conjunctivitis in dogs. It causes thick, sticky discharge.4,17
  • Allergies, often with itchy skin.18,19
  • Eyelid and eyelash problems, such as rolled-in lids, extra lashes or lumps on the lid edge.4
  • Irritants such as dust and smoke.20,4
  • Face shape. Flat-faced breeds often can't close their eyes fully and have hairs rubbing the eye.21,22

Your vet may do a tear test, a dye test for ulcers, and sometimes a swab to look at cells or grow bacteria.3,1 Treating the cause, such as tear stimulants for dry eye, is what stops the infections from coming back.3,17

Can You Buy Antibiotic Eye Drops for Dogs Over the Counter?

Not in the US anymore. Under an FDA policy, all medically important antibiotics for animals became prescription-only in June 2023, including those for pets.23,24 Approved antibiotic eye ointments for dogs and cats, such as a common tetracycline-class ointment, now carry a prescription-only label.25,26

Don't use human antibiotic creams, leftover drops or another pet's medicine instead. They may be the wrong drug, and medicine prescribed for a past problem can make the current one worse.5 Avoid tear-stain products that contain antibiotics too.27,28

Until your dog can be seen, you can gently wipe away discharge with a cloth dampened with lukewarm water or sterile saline, and use a cone to stop rubbing.5,29

Using Antibiotic Eye Medicine

  • Give it exactly as prescribed, for the full course, even if the eye looks better. These medicines only work for a short time after each dose.30,12
  • Expect improvement within days. With treatment, most conjunctivitis clears in 7 to 10 days. Your vet may recheck an ulcer after 2 to 3 days.31,2
  • Watch for reactions such as stinging, redness and swelling around the eye. Rarely, a dog has an allergic reaction with facial swelling or breathing changes, which needs a vet right away.12,30
  • Be wary of antibiotic-steroid combinations. Steroids shouldn't be used when there's any corneal ulcer, so your vet stains the eye first.32,2

See how to give your dog eye drops for step-by-step tips.

Antibiotic Resistance

Bacteria from dogs' eyes are becoming harder to treat. In the Iowa study, 1 in 5 bacteria from deep ulcers resisted several drug classes. A three-antibiotic combination still covered 96% of them, and the authors recommend a culture for serious ulcers.7 Antibiotics put directly on the eye cause less resistance than pills.1 Eye specialists keep the strongest drops for serious or deep infections.15

Frequently Asked Questions

Can you get antibiotic eye drops for dogs over the counter?

Not in the US. Since June 2023, medically important antibiotics for animals, including antibiotic eye drops and ointments, need a vet's prescription.

How can I treat my dog's eye infection at home?

Wipe away discharge with saline, stop rubbing with a cone, and see your vet within a day. Don't use human or leftover medicine.

Can a dog's eye infection go away on its own?

Mild irritation sometimes does, but most cases have a cause that needs treatment. Ulcers can get worse quickly.

How long do antibiotic eye drops take to work?

Most conjunctivitis clears in 7 to 10 days with treatment. Call your vet if it's getting worse.

Why does my dog keep getting eye infections?

Usually because of an underlying problem such as dry eye, allergies, eyelid problems or face shape.

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Sources and further reading

This article was rewritten and fact-checked on October 27, 2026 against current veterinary references and specialist guidelines:

  1. Whelan N. Antimicrobial use in animals (eye). Merck Veterinary Manual, updated November 2025.
  2. Barnes C, Weir M, Ward E. Corneal ulcers in dogs. VCA Animal Hospitals, July 2025.
  3. Gionfriddo JR. Just ask the expert: how do you treat conjunctival infections? dvm360, October 2010.
  4. Davidson M. Dry Eye and Other Causes of Conjunctivitis in Dogs. Southern European Veterinary Conference, Granada, 2016 (IVIS).
  5. Gibeault S. Dog eye infections. American Kennel Club, April 2026.
  6. Hamor RE. The cornea in animals. Merck Veterinary Manual, updated July 2026.
  7. Joksimovic M, Ford BA, Lazic T, Soldatovic I, Luzetsky S, Grozdanic S. Antibiotic recommendations for treatment of canine stromal corneal ulcers. Veterinary Sciences, 2023.
  8. Wang Z, Guo L, Li J, et al. Antibiotic resistance, biofilm formation, and virulence factors of isolates of Staphylococcus pseudintermedius from healthy dogs and dogs with keratitis. Frontiers in Veterinary Science, 2022.
  9. Johnson S, Gordon-Evans WJ. In dogs with uncomplicated corneal ulcers, do antibacterial eye drops reduce the risk of infection? Veterinary Evidence 2021;6(4) (indexed in IVIS).
  10. Williams DL. What Ophthalmic Drugs Should I Have in My Pharmacy? Southern European Veterinary Conference, Barcelona, 2013 (IVIS).
  11. Giuliano E. How I Approach... Canine Ocular Emergencies. Veterinary Focus 2015;25(3):10-17 (IVIS).
  12. Hyland K. Tetracycline-class and polymyxin antibiotic eye ointment (drug information). VCA Animal Hospitals, April 2024.
  13. Giuliano EA. Cataracts: How and When to Refer. Southern European Veterinary Conference, Barcelona, 2017 (IVIS).
  14. Giuliano EA. Eyelid Surgery Challenges. Southern European Veterinary Conference, Barcelona, 2017 (IVIS).
  15. Verbruggen AM. A Fly-over the Current Drugs Used in Ophthalmology. European Veterinary Conference Voorjaarsdagen, Amsterdam, 2013 (IVIS).
  16. Barnes C, Hunter T, Ward E. Keratoconjunctivitis sicca (KCS) or dry eye in dogs. VCA Animal Hospitals, January 2023.
  17. Haeussler DJ, Korb C. Dry eye (keratoconjunctivitis sicca). American College of Veterinary Ophthalmologists.
  18. Delgado E, Gomes É, Gil S, Lourenço AM. Diagnostic approach and grading scheme for canine allergic conjunctivitis. BMC Veterinary Research, 2023.
  19. Barnes C, Hunter T, Ward E. Conjunctivitis in dogs. VCA Animal Hospitals, May 2023.
  20. Gelatt KN. Disorders of the conjunctiva in dogs. Merck Veterinary Manual (pet owner version), updated September 2024.
  21. Plummer CE. Understanding and addressing brachycephalic ocular syndrome. Today's Veterinary Practice, April 2026.
  22. Costa J, Steinmetz A, Delgado E. Clinical signs of brachycephalic ocular syndrome in 93 dogs. Irish Veterinary Journal, 2021.
  23. American Veterinary Medical Association. Over-the-counter antimicrobials changing to prescription only, 2023.
  24. US Food and Drug Administration. FDA announces transition of over-the-counter medically important antimicrobials for animals to prescription status, June 2023.
  25. Prescription label for a tetracycline-class and polymyxin antibiotic eye ointment for dogs and cats (NADA 008-763). Veterinary drug label, revised September 2025.
  26. US Food and Drug Administration. List of approved new animal drug applications affected by GFI #263, May 2024.
  27. US Food and Drug Administration. Warning letter to a maker of a tear stain remover containing an antibiotic (CMS 524285), May 2017.
  28. Barnes C, Llera R, Ward E. Eye discharge (epiphora) in dogs. VCA Animal Hospitals, August 2023.
  29. American College of Veterinary Ophthalmologists. How to clean your pet's eyes.
  30. Hyland K. Fluoroquinolone antibiotic eye drops (drug information). VCA Animal Hospitals, May 2024.
  31. Kleszynski B. Conjunctivitis in dogs. PetMD, September 2026.
  32. Whelan N. Anti-inflammatory agents in animals (eye). Merck Veterinary Manual, updated September 2024.

About this article

Last updated : rewritten using the Merck Veterinary Manual, the FDA, the AVMA, VCA, IVIS proceedings and studies published 2021 to 2023.

This page is for general information and is not a substitute for an exam by your veterinarian.