As a licensed optician, I get asked about Polysporin eye drops at least once a day. Someone walks in with a red, goopy eye and wants to know: will these actually help? Polysporin eye drops (polymyxin B/gramicidin ophthalmic solution) are an over-the-counter antibiotic eye drop available in Canada without a prescription, used to treat minor bacterial eye infections. They are one of the very few antibiotic eye products you can buy off the shelf in this country, which is probably why so many people reach for them first.
Whether you picked these up at Shoppers or grabbed them on your way out of an optical store, here's what you should know. I am going to cover what these drops actually do, what they don't do, and the situations where you need to put them down and see your eye doctor instead.
What Are Polysporin Eye Drops and What Do They Treat?
Polysporin eye drops are a topical antibiotic designed to fight specific types of bacteria that cause eye infections. They have been available in Canada for decades and remain one of the most commonly purchased OTC eye products.
Active Ingredients
The formula contains two antibiotics working together: polymyxin B sulfate (10,000 IU/mL) and gramicidin (0.025 mg/mL). Polymyxin B targets gram-negative bacteria by disrupting their cell membranes, while gramicidin handles gram-positive bacteria. Together, they cover a broad range of the bacteria most commonly responsible for eye infections. You can verify the full product monograph on Health Canada's Drug Product Database.
What Conditions They're Designed For
Polysporin eye drops are indicated for bacterial conjunctivitis (pink eye caused by bacteria) and minor external eye infections. That is their lane. They are not designed for viral infections, allergic reactions, styes, or dry eyes. I cannot stress this enough because at least half the people who buy them are using them for something they were never meant to treat.
Key takeaway: Polysporin eye drops only work on bacterial eye infections. If your problem is viral, allergic, or structural (like a stye), these drops will not help and may delay you from getting the right treatment.
Can You Use Polysporin Eye Drops for Pink Eye?
This is the question I hear most often. The short answer: it depends on which type of pink eye you have. And that is where things get tricky, because most people assume all pink eye is the same.
There are three main types of conjunctivitis, and only one responds to Polysporin.
Bacterial conjunctivitis produces thick, yellow-green discharge that often crusts your eyelids shut overnight. It frequently starts in one eye and may spread to the other. This is where Polysporin shines. The antibiotics target the bacteria causing the infection, and most people see improvement within a couple of days.
Viral conjunctivitis is the most common form. It produces watery, clear discharge and often accompanies a cold or upper respiratory infection. Antibiotics do absolutely nothing for viral infections. Using Polysporin here is like taking Tylenol for a broken bone. It simply does not address the problem.
Allergic conjunctivitis is driven by histamine, not bacteria or viruses. Both eyes are usually affected, itching is intense, and the discharge is watery. You need antihistamine drops, not antibiotics.
I'm an optician, not a doctor. Diagnosing which type you have is something your optometrist needs to do. But here is a quick comparison to help you understand the differences:
| Feature | Bacterial | Viral | Allergic |
|---|---|---|---|
| Discharge | Thick, yellow-green | Watery, clear | Watery, clear |
| Itching | Mild | Mild | Severe |
| Eyes affected | Often starts in one | Often both | Both |
| Polysporin helps? | Yes | No | No |
| Contagious? | Yes | Yes | No |
The numbers are sobering. There are approximately 6 million acute conjunctivitis cases per year in the US alone. And according to the American Academy of Ophthalmology, nearly 60% of pink eye patients receive antibiotic drops, but most don't actually need them. The majority of pink eye cases are viral and resolve on their own.
The Canadian Association of Optometrists recommends getting a professional assessment rather than self-treating, and I agree completely. A proper exam takes minutes and can save you days of ineffective treatment.
Do Polysporin Eye Drops Work on Styes?
No. Polysporin eye drops are not designed to treat styes. I understand why people try them. You have a red, painful bump on your eyelid, and an antibiotic drop seems like it should help. But styes are a different kind of problem entirely.
A stye (hordeolum) is a blocked oil gland along your eyelid margin that becomes infected. The infection is trapped inside the gland, beneath the skin. Topical eye drops that sit on the surface of your eye cannot penetrate into a blocked gland. It is like trying to treat a splinter by washing the outside of your hand.
What actually helps styes is heat. A warm compress applied to the closed eyelid for 10 to 15 minutes, 3 to 4 times daily, softens the blocked oil and encourages the gland to drain naturally. Most styes resolve within a week or two with this approach. The American Academy of Ophthalmology has a good overview of home treatment.
If a stye does not improve after two weeks, grows rapidly, or affects your vision, see your optometrist or doctor. Some styes need to be lanced and drained, and severe cases may require oral antibiotics.
Key takeaway: Styes are blocked glands, not surface infections. Polysporin eye drops cannot reach the problem. Warm compresses (10-15 minutes, 3-4 times daily) are the standard first-line treatment.
Polysporin Eye Drops Side Effects You Should Know About
Most people tolerate Polysporin eye drops well, but side effects do happen. Here is what to watch for and how to respond.
| Side Effect | How Common | What to Do |
|---|---|---|
| Brief stinging on application | Common | Normal — resolves in 1-2 minutes |
| Temporary blurred vision | Common | Avoid driving until it clears |
| Mild redness | Common | Monitor — should improve |
| Eye swelling | Rare | Stop use, see a doctor |
| Severe itching/rash | Rare | Stop use — possible allergic reaction |
| Persistent vision changes | Rare | Stop use, see a doctor immediately |
The stinging is the one I hear about most. People put the drops in and feel a burn for a minute, then panic. That is normal. The drops are slightly different in pH from your natural tears, and your eye is sensitive. It should settle quickly.
What is not normal is increasing redness, swelling, or new symptoms that appear after you start the drops. If your eyes are getting worse instead of better, that is your signal to stop and see a professional. You may be having an allergic reaction to one of the ingredients, or the underlying condition may not be bacterial at all.
Are Polysporin Eye Drops Safe for Kids?
Parents ask me this one a lot, especially during back-to-school season when pink eye tears through classrooms. Polysporin eye drops are generally considered suitable for children aged 2 and older. For children under 2, you should see your pediatrician or family doctor before using any eye medication.
The tricky part with kids is not the drops themselves. It is actually getting the drops into the eye. If you have ever tried to hold a squirming toddler still while aiming a dropper at their eye, you know exactly what I mean.
Here is a technique that works well: have the child lie down and close their eyes. Place one drop in the inner corner of the eye (near the nose). Then have them open their eyes, and the drop rolls in naturally. No fighting, no prying eyelids open. Parents tell me this method is a game changer.
If there is no improvement after 2 days, or if the child develops fever, significant swelling, or complaints of pain (not just irritation), stop the drops and see your pediatrician. Children can develop complications more quickly than adults, and what looks like simple pink eye can occasionally be something that needs prescription treatment.
Antibiotic Eye Drops Over the Counter in Canada
Canada is somewhat unique in that we have OTC antibiotic eye drops at all. In the United States, you need a prescription for any antibiotic eye medication. Here, Polysporin eye drops sit on the pharmacy shelf alongside allergy drops and artificial tears.
That said, Polysporin is really the only OTC antibiotic option for eyes in Canada. Anything stronger or with a different antibiotic class requires a prescription from your doctor or optometrist. Here is how the landscape looks:
| Product | OTC in Canada? | Active Ingredients | Best For |
|---|---|---|---|
| Polysporin Eye Drops | Yes | Polymyxin B, Gramicidin | Minor bacterial conjunctivitis |
| Polysporin Eye & Ear | Yes | Polymyxin B, Gramicidin | Eye and ear infections |
| Tobramycin drops | Prescription | Tobramycin | Moderate-severe infections |
| Ciprofloxacin drops | Prescription | Ciprofloxacin | Resistant/severe infections |
| Erythromycin ointment | Prescription | Erythromycin | Newborns, chlamydial |
The prescription options are broader-spectrum or target specific resistant bacteria. Your doctor or optometrist will prescribe them when the infection is moderate to severe, has not responded to OTC treatment, or when they identify a specific bacteria that needs targeted therapy.
For general medication information, Alberta Health Services maintains a useful reference on eye infection treatments that Albertans may find particularly relevant.
One important note: just because Polysporin is OTC does not mean you should use it casually. Antibiotic resistance is real, and using antibiotics when you do not need them contributes to the problem. If you are unsure whether your infection is bacterial, see your optometrist first.
How to Use Polysporin Eye Drops Properly
Proper technique matters more than most people realize. Bad technique can reduce effectiveness or even introduce new bacteria into your eye. Here is the right way to do it:
- Wash your hands thoroughly with soap and water. This is the most important step. Dirty hands near an infected eye is how infections spread.
- Tilt your head back and look up at the ceiling.
- Pull down your lower eyelid gently to create a small pocket between the lid and your eyeball.
- Hold the dropper above the pocket without touching your eye or eyelid with the tip. Squeeze one drop into the pocket.
- Close your eye gently for 1 to 2 minutes. Do not squeeze it shut or blink rapidly. Press lightly on the inner corner of your eye near the nose to prevent the drop from draining into your tear duct.
- Wipe away any excess with a clean tissue.
- Repeat for the other eye if prescribed for both. Use a fresh tissue.
Apply 1 to 2 drops in the affected eye(s), 4 times daily, for 7 to 10 days. Even if your symptoms disappear after a few days, finish the full course. Stopping early is the most common mistake I see, and it is the reason people end up back at the pharmacy a week later with the same infection.
When to Skip the Drops and See an Eye Doctor Instead
Polysporin has its place, but it is not a substitute for professional care. Here are the situations where you should skip the OTC aisle and book an eye exam:
- Your vision is affected. Any blurring, halos, or vision loss with an eye infection is a red flag. Do not wait.
- You have pain inside the eye. Surface irritation is one thing. Deep, aching pain suggests something more serious than conjunctivitis.
- No improvement after 48 hours. If you have been using Polysporin correctly for two days and things are not getting better (or are getting worse), the infection may not be bacterial.
- The patient is a child under 2. Young children need professional assessment before any medication.
- You have had recent eye surgery. Post-surgical infections require immediate professional care, not OTC drops.
- The discharge is heavy or bloody. This goes beyond what Polysporin is designed to handle.
- This keeps happening. Recurring eye infections can signal an underlying issue like chronic blepharitis, blocked tear ducts, or immune problems.
The Mayo Clinic echoes this guidance: seek care promptly if symptoms are severe, vision is involved, or the infection is not improving.
Put the drops down and book an eye exam. A 15-minute visit can give you a proper diagnosis and the right treatment the first time, instead of a week of guessing.
Frequently Asked Questions
Can I use Polysporin eye drops for dry eyes?
No. Polysporin eye drops are antibiotics. They fight bacteria, not dryness. Using them for dry eyes will not provide relief and wastes an antibiotic unnecessarily. For dry eyes, you need artificial tears (lubricating drops). Brands like Systane, Refresh, and Hylo are designed specifically for lubrication. If you use them more than four times a day, choose preservative-free options to avoid irritation from the preservatives themselves.
How long does it take for Polysporin eye drops to work?
Most people notice improvement within 24 to 48 hours. The redness decreases, discharge slows, and comfort improves. However, you must finish the full 7 to 10 day course even if you feel better sooner. Stopping early is the number one reason bacterial eye infections come back. The remaining bacteria that survived the initial days of treatment can multiply and cause a recurrence that may be harder to treat.
Can I wear contacts while using Polysporin eye drops?
No. Remove your contact lenses before starting Polysporin and leave them out until the full treatment course is finished and the infection has completely cleared. Your old lenses may harbour bacteria, so start with a fresh pair after treatment. If you wear daily disposables, this is straightforward. For monthly or biweekly lenses, discard the pair you were wearing when the infection started. Your eyes will thank you.
Are Polysporin eye drops the same as regular Polysporin?
Absolutely not, and this matters. Regular Polysporin (the ointment or cream for cuts and scrapes) is formulated for skin. It contains different active ingredients, different concentrations, and different inactive ingredients. It is not safe for use in your eyes. Polysporin Eye Drops are a completely separate ophthalmic formulation that has been tested and approved specifically for eye use. Never substitute one for the other. I have had patients come in who made this mistake, and it does not go well.
Can I use expired Polysporin eye drops?
No. Discard Polysporin eye drops 30 days after opening, regardless of the printed expiry date on the box. Once the bottle is opened, the sterility starts to degrade. After 30 days, you are potentially putting contaminated solution into an already vulnerable eye. Write the date you opened them on the box with a marker. If you cannot remember when you opened the bottle, throw it out and get a new one. It is not worth the risk for a product that costs under $15.
Do I need a prescription for Polysporin eye drops in Canada?
No. Polysporin eye drops (DIN 02239156) are available over the counter at any Canadian pharmacy. You can pick them up at Shoppers Drug Mart, Rexall, Walmart, London Drugs, or any pharmacy without a prescription. They are typically in the eye care aisle near the artificial tears. Worth noting: this is a Canada-specific situation. In the United States, all antibiotic eye drops require a prescription, which is why American visitors are sometimes surprised to find them on our shelves.
Are Polysporin eye drops safe during pregnancy or breastfeeding?
Talk to your doctor before using them. Polysporin eye drops have low systemic absorption, meaning very little of the medication gets into your bloodstream. However, there is insufficient clinical data specifically studying their safety during pregnancy and breastfeeding. Your doctor or pharmacist can weigh the risks and benefits for your situation. In many cases they may still recommend them, but that is a conversation to have with a healthcare provider, not a decision to make on your own based on an internet article.
This article is for informational purposes only and does not constitute medical advice. Always consult your optometrist, ophthalmologist, or family doctor for diagnosis and treatment of eye conditions.