Amoxicillin is the go-to antibiotic for most middle ear infections, and it has been for decades. It’s effective against the bacteria most commonly responsible, it’s inexpensive, and it causes relatively few side effects. But the right choice depends on your age, allergy history, and how severe the infection is. In some cases, antibiotics aren’t needed at all.
Why Some Ear Infections Don’t Need Antibiotics
Not every ear infection is bacterial. Studies sampling fluid from infected middle ears in children have found that 55 to 92 percent of cases involve bacteria, but 5 to 22 percent appear to be purely viral, and in 16 to 25 percent of cases no pathogen can be detected at all. An antibiotic won’t help in those situations, and overprescribing contributes to drug resistance.
That’s why current guidelines support a “watchful waiting” approach for certain patients. According to CDC criteria, children between 6 months and 23 months old qualify 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 can wait and watch even if both ears are involved, as long as those same mild-symptom criteria are met. During watchful waiting, pain is managed with over-the-counter pain relievers, and a prescription is filled only if symptoms worsen or don’t improve within 48 to 72 hours.
Amoxicillin: The Standard First Choice
When antibiotics are warranted, amoxicillin is almost always the starting point. It targets the three bacteria most commonly found in middle ear infections and reaches effective concentrations in middle ear fluid. For children, the typical dose is calculated by weight at 80 to 90 milligrams per kilogram per day, split into two doses.
If amoxicillin alone doesn’t clear the infection within 48 to 72 hours, or if the infection is severe from the start (high fever, significant pain, or both ears affected in a young child), the next step is usually amoxicillin-clavulanate. This combination pairs amoxicillin with a second ingredient that blocks a defense mechanism some bacteria use to resist the drug. For adults, the standard dose is 875 mg of amoxicillin with 125 mg of clavulanate, taken twice daily.
How Long You’ll Take Them
Treatment length depends mainly on age and severity. For children 2 and older with an uncomplicated infection, five days of antibiotics works just as well as ten. Younger children (under 2), kids with recurring ear infections, or cases where the eardrum has ruptured typically need a full ten-day course. Adults generally follow a similar 7- to 10-day regimen depending on how quickly symptoms resolve.
Finishing the full course matters even after symptoms improve. Stopping early can leave enough bacteria alive to rebound, potentially creating a harder-to-treat infection the second time around.
Options If You’re Allergic to Penicillin
Since amoxicillin belongs to the penicillin family, anyone with a penicillin allergy needs an alternative. The options depend on how severe the allergy is.
- Mild penicillin allergy (rash but no breathing problems or swelling): Cefdinir, cefuroxime, and cefpodoxime are oral alternatives. These belong to a related drug class called cephalosporins, which most people with mild penicillin allergies tolerate without issues. Ceftriaxone, given as an injection for up to three days, is another option in this category.
- Severe penicillin allergy (anaphylaxis, throat swelling, difficulty breathing): Cephalosporins carry a small cross-reactivity risk, so they’re generally avoided. Levofloxacin is an option for children with severe allergies. For adults, similar fluoroquinolone-class drugs may be prescribed.
If you’ve been told you’re allergic to penicillin but the reaction happened in childhood, it may be worth getting re-tested. Many people outgrow penicillin allergies, and confirming you can tolerate it opens the door to more effective, narrower-spectrum treatment.
When the First Antibiotic Doesn’t Work
If symptoms haven’t improved after two to three days on amoxicillin, your doctor will typically switch to amoxicillin-clavulanate if you weren’t already on it. The viral component of some ear infections can also play a role in apparent antibiotic failure. Studies have found viruses present alongside bacteria in up to 66 percent of infected ears in some groups, which can slow recovery even when the right antibiotic is on board.
Persistent or worsening symptoms after a second antibiotic course, especially increasing pain, fever, or swelling behind the ear, warrant prompt follow-up. These can signal complications like a spreading infection that may need a different treatment approach entirely.
Ear Drops vs. Oral Antibiotics
The antibiotics discussed above are all oral (or occasionally injected) and are used for middle ear infections, where fluid is trapped behind the eardrum. Antibiotic ear drops treat a different problem: outer ear infections, sometimes called swimmer’s ear. These drops typically contain a fluoroquinolone antibiotic and often a steroid to reduce swelling. If your eardrum has a tube or a perforation, your doctor may also use antibiotic drops that are safe to pass through to the middle ear, rather than oral antibiotics.
The distinction matters because oral antibiotics won’t effectively treat swimmer’s ear, and ear drops can’t reach the middle ear through an intact eardrum. Knowing which type of ear infection you have determines which form of antibiotic is appropriate.