Amoxicillin is the best first-line antibiotic for most ear infections in children. For adults, amoxicillin-clavulanate (a stronger version that covers more bacteria) is generally preferred. The right choice depends on age, symptom severity, allergy history, and whether antibiotics are even necessary in the first place.
Why Amoxicillin Is the Standard Choice
Amoxicillin has been the go-to antibiotic for middle ear infections (acute otitis media) in children for decades, and it still holds that position. It’s effective against the most common bacteria that cause ear infections, it’s inexpensive, it tastes reasonable in liquid form, and it has a well-established safety profile. The CDC recommends it as first-line therapy for any child who hasn’t taken amoxicillin in the past 30 days.
For adults, the recommendation shifts slightly. UpToDate, a widely used clinical reference, favors amoxicillin-clavulanate as the first choice for adult ear infections. The added ingredient broadens the antibiotic’s reach to cover bacteria that have developed resistance to plain amoxicillin. Adults who are over 65, immunocompromised, or have used antibiotics recently may need a higher dose to account for resistant bacteria.
When a Different Antibiotic Is Needed
Several situations call for something other than standard amoxicillin:
- Recent amoxicillin use. If your child took amoxicillin within the past 30 days, amoxicillin-clavulanate is recommended instead.
- Pink eye alongside the ear infection. When purulent (goopy) conjunctivitis is present at the same time, amoxicillin-clavulanate is the better pick because a different type of bacteria is more likely involved.
- Repeat infections that didn’t respond to amoxicillin. Children with recurrent ear infections that kept coming back despite amoxicillin should move to amoxicillin-clavulanate.
Options If You’re Allergic to Penicillin
Since amoxicillin belongs to the penicillin family, people with penicillin allergies need alternatives. Which one depends on how severe the allergy is.
If the allergic reaction was mild (a rash, for example, but not hives or throat swelling), certain cephalosporin antibiotics are considered safe. These include cefdinir, cefuroxime, and cefpodoxime as oral options, or ceftriaxone as an injection. Ceftriaxone is also useful when a child is vomiting and can’t keep oral medication down.
If the allergy involved hives, facial swelling, or anaphylaxis, cephalosporins are off the table too. In that case, the alternatives are azithromycin (often sold as a Z-pack), clarithromycin, or clindamycin. These belong to completely different antibiotic families and don’t cross-react with penicillin.
Not Every Ear Infection Needs Antibiotics
This is the part many people don’t expect: a significant number of ear infections can resolve on their own with just pain management. Guidelines support a “watchful waiting” approach for certain children, where you manage pain for 48 to 72 hours and only fill an antibiotic prescription if symptoms don’t improve or get worse.
Watchful waiting is appropriate for children 6 months to 2 years old with a mild, one-sided ear infection and no drainage, and for children 2 and older with mild symptoms on one or both sides. Many doctors will write the prescription but tell you to wait a few days before filling it.
Antibiotics should be started right away for babies under 6 months, children 6 to 23 months with infections in both ears, any child with ear drainage, and any child with severe symptoms. Severe means a temperature of 102.2°F or higher, ear pain lasting more than 48 hours, or moderate to severe pain intensity.
How Long the Course Lasts
For younger children (under 2), the standard treatment duration is 10 days. Research from the American Academy of Pediatrics compared 5-day and 10-day courses in children ages 6 to 23 months and found a striking difference: the 5-day group had a 34% failure rate compared to 16% in the 10-day group. That gap is large enough that 10 days remains the clear recommendation for this age group.
For children 2 and older with mild to moderate infections, some clinicians are comfortable prescribing a shorter 5- to 7-day course, particularly if symptoms have already resolved. Adults typically take a 7- to 10-day course depending on severity.
When to Expect Improvement
Once antibiotics are started, most children feel noticeably better within 2 to 3 days. Fever typically breaks within 48 hours. Ear pain should start improving by day 2 and be gone by day 3. If symptoms aren’t improving after 48 to 72 hours on antibiotics, that’s a signal the bacteria may be resistant and a different antibiotic is needed.
In the meantime, over-the-counter pain relievers (ibuprofen or acetaminophen) are the most important part of early treatment. Pain management matters whether or not antibiotics are prescribed, and it’s often what makes the first couple of days bearable.
Outer Ear Infections Are Treated Differently
Everything above applies to middle ear infections, which happen behind the eardrum. Outer ear infections (sometimes called swimmer’s ear) are a completely different condition and use a completely different treatment: antibiotic ear drops rather than oral antibiotics.
The most common prescription is a combination drop containing ciprofloxacin (an antibiotic) and dexamethasone (a steroid to reduce swelling), sold under the brand name Ciprodex. It’s applied twice a day, morning and evening, for 7 days. These drops work directly at the infection site and don’t carry the same side effects as oral antibiotics.
If you’re unsure which type of ear infection you or your child has, the location of pain is a clue. Middle ear infections cause deep pain and often follow a cold. Outer ear infections cause pain when you tug on the outer ear or press on the small flap in front of the ear canal, and the canal itself may look red or swollen.