Amoxicillin is the best first-line antibiotic for acute otitis media (middle ear infection) in adults. A standard course is high-dose amoxicillin for 10 days, the same recommendation applied to children. While ear infections are far more common in kids, adults get them too, and the bacterial causes and treatment approach are largely the same.
Why Amoxicillin Is First Choice
Three bacteria are responsible for more than 95% of bacterial ear infections: Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis. Amoxicillin covers the most common of these effectively, is inexpensive, well-tolerated, and has a narrow enough spectrum to limit unnecessary disruption to your gut bacteria.
There are no standalone practice guidelines specifically for adult otitis media. Recommendations are adapted from well-established pediatric guidelines, since the underlying infection behaves the same way regardless of age. High-dose amoxicillin for 10 days is the standard when a bacterial cause is suspected.
When Your Doctor May Choose a Stronger Option
Amoxicillin-clavulanate (sold as Augmentin) is the usual step-up. It adds a compound that defeats a common bacterial defense mechanism, making it effective against resistant strains. Guidelines recommend it in three specific situations:
- Concurrent pink eye (conjunctivitis): This combination suggests a pathogen more likely to resist plain amoxicillin.
- Recent amoxicillin use: If you took amoxicillin within the past 30 days for any reason, the bacteria in your ear are more likely to have developed resistance.
- Recurrent infections: A history of ear infections that didn’t respond to amoxicillin alone warrants the broader coverage.
Options if You’re Allergic to Penicillin
Since amoxicillin is a penicillin-type drug, a true allergy takes it off the table. The good news is that cross-reaction with cephalosporin antibiotics is rare, so most penicillin-allergic patients can safely take a cephalosporin alternative. Common choices include cefuroxime (taken twice daily) and cefdinir.
If cephalosporins are also off-limits, macrolide antibiotics like azithromycin or clarithromycin are the next option. Azithromycin is typically prescribed as a 5-day course rather than 10 days because the drug stays active in tissues longer. These macrolides don’t cover the same range of bacteria as well as amoxicillin, so they’re reserved for situations where penicillin-family drugs truly can’t be used.
Watchful Waiting: Not Every Ear Infection Needs Antibiotics Immediately
Not all middle ear infections require antibiotics right away. Many are viral or resolve on their own. For nonsevere cases, guidelines support a “watch and wait” approach: monitoring symptoms for 48 to 72 hours before starting antibiotics. If pain worsens, fever develops, or symptoms don’t improve in that window, it’s time to fill the prescription.
This approach works best when you have reliable follow-up with your doctor. You’ll typically receive a prescription to hold onto, with instructions to start it if things don’t improve within two to three days. The goal is to avoid unnecessary antibiotic use while still catching infections that need treatment before they progress.
Managing Pain While You Recover
Ear infections hurt, often intensely. Pain relief matters whether or not you start antibiotics immediately. Ibuprofen and acetaminophen are the go-to options and can be taken at standard label doses. Ibuprofen has the advantage of reducing inflammation alongside pain.
Numbing ear drops can provide short-term relief but should only be used if your eardrum is intact, with no hole or tear. A warm compress held against the affected ear also helps some people. Even after starting antibiotics, expect ear pain to take one to two days to noticeably improve.
Why Treatment Matters
Most acute ear infections resolve without serious complications, especially with appropriate treatment. But untreated or poorly treated infections can escalate. Mastoiditis, an infection of the bone behind the ear, is the most common complication of acute otitis media, occurring in a significant percentage of complicated cases. Chronic, repeated infections carry even higher risks: a study of patients with complications from otitis media found hearing loss in 90% of cases and permanent neurological problems in 29%. Patients whose ear infections progressed to meningitis had more than seven times the risk of deafness.
These severe outcomes are uncommon with timely treatment, but they underscore why ear infections in adults shouldn’t be dismissed as trivial. Persistent symptoms beyond 72 hours, high fever, drainage from the ear, or symptoms spreading to the area behind the ear all warrant prompt medical attention.