For most cases of swimmer’s ear, the best antibiotic is a combination ear drop that pairs an antibiotic with a steroid to fight the infection and reduce pain at the same time. Two options consistently come out on top: neomycin/polymyxin B/hydrocortisone (often called Cortisporin) and ciprofloxacin/dexamethasone (Ciprodex). Clinical trials show these are equally effective at clearing the infection, so the choice between them usually comes down to cost, your eardrum’s condition, and how often you want to use the drops each day.
The Two Main Options Compared
Neomycin/polymyxin B/hydrocortisone is the classic first-line choice. It works against the bacteria most commonly responsible for swimmer’s ear, including Pseudomonas and Staphylococcus species, and the hydrocortisone component helps reduce swelling and pain. It’s also significantly cheaper than newer alternatives, which is why many guidelines recommend it as the default starting point when cost matters.
Ciprofloxacin/dexamethasone is a fluoroquinolone-based drop with broader bacterial coverage, including activity against MRSA. The standard dose is 4 drops in the affected ear twice a day for 7 days. That twice-daily schedule is a practical advantage over neomycin-based drops, which typically require three or four applications per day. Fewer doses per day can make it easier to stick with the full course of treatment.
A three-way clinical comparison found that ciprofloxacin with hydrocortisone and the neomycin/polymyxin B/hydrocortisone combination both resolved pain in about 3.8 days, while ciprofloxacin alone (without a steroid) took closer to 4.8 days. The takeaway: adding a steroid to either antibiotic makes a noticeable difference in how quickly you feel better.
Why Your Eardrum Status Matters
The single biggest factor in choosing between these two drops is whether your eardrum is intact. Neomycin and polymyxin B belong to a class of antibiotics called aminoglycosides, and if those medications pass through a hole or tear in the eardrum into the middle ear, they carry a risk of damaging hearing. Both U.S. and U.K. guidelines list aminoglycoside drops as contraindicated when the eardrum is perforated or has tubes in it.
Fluoroquinolone drops like ciprofloxacin/dexamethasone and ofloxacin are approved for middle ear use, making them the safer pick any time the eardrum might not be intact. If your doctor can’t get a clear view of the eardrum because of swelling or debris in the canal, they’ll generally default to a fluoroquinolone drop to be safe.
When Ear Drops Alone Aren’t Enough
Oral antibiotics are not part of standard swimmer’s ear treatment. Topical drops delivered directly to the ear canal reach much higher concentrations at the infection site than a pill could, and they avoid the side effects that come with systemic antibiotics. Oral antibiotics enter the picture only when the infection has spread beyond the ear canal, such as into surrounding skin (cellulitis), lymph nodes, or deeper tissue. People with diabetes or weakened immune systems are at higher risk for this kind of spread and may need oral treatment sooner.
If your ear canal is so swollen that drops can’t get through, your doctor may place a small sponge wick into the canal. The wick absorbs the drops and keeps them in contact with the infected tissue until the swelling goes down enough for drops to flow in on their own.
What Recovery Looks Like
With appropriate drops, most people notice improvement within one to three days. Pain and discharge typically resolve completely in seven to ten days, and uncomplicated cases often clear within five days. If symptoms haven’t started improving after 48 to 72 hours of consistent treatment, it’s worth following up, because the infection may be caused by something other than typical bacteria.
When the Cause Isn’t Bacterial
About 10% of swimmer’s ear cases are fungal rather than bacterial, a condition called otomycosis. Fungal infections tend to cause intense itching and a thicker, sometimes dark-colored discharge. Standard antibiotic drops won’t help and can actually make things worse by killing off bacteria that normally keep fungal growth in check.
Fungal ear infections are treated with antifungal ear drops such as clotrimazole or fluconazole. For infections affecting the outer ear, topical antifungal creams can work. Acetic acid or aluminum acetate drops are sometimes used alongside antifungals to lower the pH in the ear canal, creating an environment fungi struggle to grow in. Stubborn fungal infections may require oral antifungal medication.
Preventing Recurrence
If you swim regularly and have had swimmer’s ear before, a simple preventive rinse can reduce the odds of it coming back. Mix one part white vinegar with one part rubbing alcohol and put a few drops in each ear after swimming. The alcohol helps evaporate trapped water, while the vinegar restores the ear canal’s naturally acidic environment, which discourages bacterial and fungal growth. Skip this rinse if you have any ear pain, drainage, or a known eardrum perforation.
Keeping the ear canal dry is the most effective prevention strategy overall. Tilt your head to each side after swimming to let water drain, and use a towel to gently dry the outer ear. Avoid inserting cotton swabs or other objects into the canal. They strip away the thin layer of protective earwax and can create tiny scratches that give bacteria an entry point.