Amoxicillin is the most commonly prescribed antibiotic for middle ear infections, and it remains the go-to choice for both children and adults. But the right antibiotic depends on the type of ear infection you have, your age, allergy history, and whether you’ve taken antibiotics recently. In some cases, you may not need antibiotics at all.
Not Every Ear Infection Needs Antibiotics
Most ear infections in young children are caused by viruses or will clear on their own, so doctors often recommend a “watchful waiting” approach before prescribing anything. The CDC outlines specific criteria for when observation is appropriate: children between 6 months and 23 months old can safely wait if only one ear is infected, symptoms have lasted less than two days, pain is mild, and their temperature is below 102.2°F. Children 2 years and older qualify for watchful waiting even if both ears are involved, as long as those same mild symptom criteria are met.
Watchful waiting means managing pain with over-the-counter pain relievers and rechecking within 48 to 72 hours. If symptoms worsen or don’t improve, the doctor starts antibiotics at that point. This approach helps avoid unnecessary antibiotic use, which matters because resistance among common ear infection bacteria is climbing. A large multicenter study found that nearly 57% of the most common ear infection bacterium showed resistance to at least one drug class, with resistance rates increasing roughly 1% per year.
First-Line Antibiotics for Middle Ear Infections
When antibiotics are needed, standard amoxicillin is the first choice for children. It works well against the bacteria most often responsible, it’s inexpensive, tastes acceptable to kids, and has a long track record. The typical course for children under 2 is 10 days. For children 2 and older with a mild, uncomplicated infection, guidelines from the American Academy of Pediatrics recommend a shorter 5 to 7 day course.
For adults, guidelines favor starting with amoxicillin-clavulanate rather than plain amoxicillin. The standard adult dose is 875 mg of amoxicillin combined with 125 mg of clavulanate, taken twice daily. The clavulanate component helps the antibiotic work against bacteria that have developed the ability to break down amoxicillin on their own.
In children, doctors typically escalate to amoxicillin-clavulanate when standard amoxicillin fails after 48 to 72 hours, when the child has taken amoxicillin within the past 30 days, or when the ear infection occurs alongside pink eye (a combination that suggests a different bacterial culprit).
Options If You’re Allergic to Penicillin
Since amoxicillin belongs to the penicillin family, allergies require a different strategy. The alternative depends on how severe your allergy is.
If your reaction to penicillin was mild (no hives or breathing problems), certain cephalosporin antibiotics are considered safe. Common options for children include cefdinir, cefpodoxime, and cefuroxime, all taken by mouth. These belong to a related drug class but carry a very low risk of cross-reaction when the original penicillin allergy was minor.
If you’ve ever had hives, facial swelling, or anaphylaxis from penicillin, cephalosporins are off the table too. In that case, doctors turn to a different class entirely. Azithromycin (a five-day course, or sometimes a single dose) and clarithromycin are the most common substitutes. Clindamycin is another option. However, these alternatives face a growing resistance problem. Resistance to macrolide antibiotics like azithromycin has been increasing at about 5% per year in the bacteria that cause ear infections, with overall macrolide resistance reaching nearly 40% in one large U.S. study. That means these backup antibiotics fail more often than they used to.
Ear Drops for Swimmer’s Ear
Swimmer’s ear (an infection of the outer ear canal) is a completely different condition from a middle ear infection, and it’s treated with antibiotic ear drops rather than oral antibiotics. The most commonly prescribed drops contain ciprofloxacin or ofloxacin, both fluoroquinolone antibiotics. Many formulations combine the antibiotic with a steroid to reduce swelling and pain. Cure rates with these topical treatments run between 87% and 97%.
Oral antibiotics are rarely needed for swimmer’s ear. The infection sits in the ear canal where drops can reach it directly, making topical treatment both faster and more effective than a pill.
Treating Chronic Ear Infections
A chronic ear infection, where the eardrum has a perforation and the ear drains persistently, follows its own treatment rules. Antibiotic ear drops are the primary therapy here too. Ciprofloxacin or ofloxacin drops are instilled twice a day for 10 to 14 days. Some formulations include a steroid (dexamethasone) to control inflammation.
One important caution with chronic infections: older-style ear drops containing aminoglycoside antibiotics (like neomycin) or polymyxin should not be used when the eardrum has a hole or when ear tubes are in place. These medications can damage the inner ear structures responsible for hearing. The fluoroquinolone drops don’t carry this risk, which is why they’re preferred.
Oral antibiotics are reserved for severe flare-ups of chronic ear infections. When needed, amoxicillin or a third-generation cephalosporin is typically prescribed for 10 days, sometimes adjusted based on culture results from the ear drainage.
Common Side Effects
Antibiotics for ear infections are generally well tolerated, but side effects occur in about 1 in 5 children who take them. The most frequent issues are diarrhea, stomach pain, nausea, and rashes. In younger children, diarrhea from amoxicillin commonly leads to diaper rash. Allergic reactions are possible but uncommon.
These side effects are one reason the watchful waiting approach exists. For a child with mild symptoms and a good chance of recovering without medication, avoiding antibiotics also means avoiding the side effects. When antibiotics are clearly needed, though, the benefit of clearing the infection outweighs the risk of a few days of loose stools. Giving the medication with food can help reduce stomach-related side effects.
Why Finishing the Full Course Matters
Resistance among ear infection bacteria is a real and measurable problem. Nearly 40% of the most common ear infection bacterium now shows resistance to penicillin, and about 31% are resistant to two or more drug classes. Children under 2 carry the highest resistance rates. Stopping antibiotics early when symptoms improve gives partially resistant bacteria a chance to survive and multiply, potentially making the next infection harder to treat. Completing the prescribed course, whether it’s 5 days or 10, gives the antibiotic the best chance of eliminating the infection fully.