Amoxicillin is the standard first-line antibiotic for middle ear infections in both children and adults. The American Academy of Pediatrics recommends high-dose amoxicillin as the go-to treatment for uncomplicated acute otitis media, the medical term for a middle ear infection. But the right antibiotic depends on the type of ear infection you’re dealing with, your age, allergy history, and how severe your symptoms are.
Amoxicillin for Middle Ear Infections
For children without a penicillin allergy, the current guideline calls for high-dose amoxicillin at 80 to 90 mg per kg per day, split into two doses. This higher dose was adopted because the bacteria that cause most ear infections have become harder to kill at standard doses. About 2 in 5 infections caused by one of the most common culprits, Streptococcus pneumoniae, now show resistance to at least one antibiotic.
Three bacteria are responsible for the majority of middle ear infections in young children: Haemophilus influenzae (roughly 32% of cases in children under 2), Streptococcus pneumoniae (about 19%), and Moraxella catarrhalis (around 3%). High-dose amoxicillin targets these bacteria effectively, which is why it remains the first choice despite decades of use.
For adults, amoxicillin is also the standard pick, though doctors sometimes start with amoxicillin-clavulanate (Augmentin) if symptoms are severe or the infection hasn’t responded to plain amoxicillin. Augmentin adds coverage against bacteria that can break down amoxicillin on their own.
If You’re Allergic to Penicillin
The alternative depends on how serious your allergy is. If your reaction to penicillin was mild and didn’t involve hives or a severe allergic response, certain cephalosporin antibiotics are considered safe. Options include cefdinir, cefpodoxime, and cefuroxime, all taken by mouth.
If you’ve ever had hives or anaphylaxis from penicillin, cephalosporins are off the table. In that case, doctors typically turn to azithromycin (the well-known Z-pack), clarithromycin, or clindamycin. Azithromycin has the advantage of a shorter course, sometimes as brief as a single high dose or a three-day regimen, and it causes diarrhea at a much lower rate (about 2.2%) compared to other options.
Not Every Ear Infection Needs Antibiotics
Two out of three children with mild ear infections recover without any antibiotic at all. The immune system clears the infection on its own. This is why pediatricians often recommend “watchful waiting,” meaning you observe your child for two to three days before starting medication.
Watchful waiting is appropriate when:
- Your child is between 6 months and 23 months old and only one ear is infected, with mild pain and a temperature below 102.2°F
- Your child is 2 years or older with one or both ears infected, symptoms lasting less than 2 days, mild pain, and a temperature below 102.2°F
This doesn’t mean ignoring the infection. You manage pain with over-the-counter pain relievers during the observation window, and if symptoms worsen or don’t improve within two to three days, you fill the antibiotic prescription. Many pediatricians write a “safety net” prescription you can use if needed.
How Long the Course Lasts
Treatment length varies by age and severity. Children under 2 typically get a full 10-day course because their immune systems are less mature and their ear anatomy makes infections harder to clear. Children 2 and older with mild, uncomplicated infections can often be treated with a shorter 5- to 7-day course, per the AAP’s 2013 guidelines.
Finishing the entire course matters even if symptoms improve in a day or two. Stopping early can leave surviving bacteria behind, increasing the chance of a resistant, harder-to-treat infection coming back.
Outer Ear Infections Use Different Treatment
If the infection is in your ear canal rather than behind the eardrum, you’re dealing with otitis externa, commonly called swimmer’s ear. This type of infection is treated with antibiotic ear drops, not oral antibiotics. The most commonly prescribed drops combine neomycin, polymyxin, and hydrocortisone. The antibiotics kill bacteria directly in the ear canal, while hydrocortisone reduces swelling and pain.
These drops are typically used three to four times a day for up to 10 days. If the ear canal is very swollen, your doctor may place a small cotton wick inside to help the drops reach deeper. The wick gets replaced at least every 24 hours. Oral antibiotics are only added for outer ear infections if the infection has spread beyond the ear canal or if you have a weakened immune system.
Common Side Effects to Expect
Diarrhea is the most frequent side effect across all ear infection antibiotics, but rates vary dramatically. Amoxicillin-clavulanate causes diarrhea in up to 19% of children, while azithromycin causes it in only about 2%. Standard amoxicillin falls somewhere in between. When parents tracked symptoms in daily diaries, diarrhea rates were even higher, reaching 15 to 21% depending on the antibiotic.
Skin rash occurs in roughly 1.4% to 6.5% of children, with high-dose amoxicillin at the higher end of that range. In younger children still in diapers, diaper rash is another common complaint, affecting about 5% of children on antibiotics and climbing as high as 15% with amoxicillin-clavulanate. Yeast-related diaper rash can also develop because antibiotics disrupt the normal balance of bacteria on skin.
These side effects are typically mild and resolve once the antibiotic course ends. If your child develops a widespread rash, difficulty breathing, or significant swelling, that could signal an allergic reaction rather than a routine side effect.
When the First Antibiotic Doesn’t Work
If symptoms haven’t improved after 48 to 72 hours on amoxicillin, the next step is usually switching to amoxicillin-clavulanate or a cephalosporin. Some children receive an injection of ceftriaxone, which delivers a powerful single dose and is especially useful when a child can’t keep oral medication down. For recurrent infections, a three-dose course of ceftriaxone over three days is sometimes used.
Recurrent ear infections, defined as three or more episodes in six months or four in a year, may prompt a conversation about ear tubes. These tiny tubes are placed in the eardrum during a brief outpatient procedure and help fluid drain from the middle ear, reducing the frequency and severity of future infections.