Amoxicillin can treat some ear infections, but not all of them
Amoxicillin is an antibiotic that kills bacteria. It works against many of the bacteria that cause ear infections, particularly Streptococcus pneumoniae and Haemophilus influenzae, which are common culprits in middle ear infections. Your doctor may prescribe it if they believe a bacterial infection is causing your symptoms.
However, amoxicillin does not work against viral infections, and many ear infections start as viral illnesses. It also does not work against all bacterial strains — some bacteria have developed resistance to amoxicillin, meaning the antibiotic cannot kill them. Your doctor will decide whether amoxicillin is the right choice based on what they observe during an exam and what they know about which bacteria are circulating in your area.
Key Takeaways
- Amoxicillin treats bacterial ear infections but does nothing against viral infections, which make up a significant portion of ear infection cases.
- Your doctor determines whether to prescribe amoxicillin by examining your ear and considering your symptoms, age, and medical history.
- Amoxicillin typically takes two to three days to reduce pain and fever, though you should take the full course even if you feel better.
- Some bacteria no longer respond to amoxicillin, so your doctor may switch you to a different antibiotic if symptoms do not improve within three days.
- Ear infections often resolve on their own, and pain relief is sometimes the main treatment while your body fights the infection.
When doctors prescribe amoxicillin for ear infections
Your doctor will prescribe amoxicillin if they suspect a bacterial middle ear infection — the most common type in children and adults. During an exam, they look inside your ear with an otoscope, a small handheld light. They are looking for a bulging eardrum or fluid behind the eardrum, both signs of bacterial infection.
Age matters in this decision. Children under six months old are less likely to receive amoxicillin as a first choice because their immune systems respond differently to antibiotics. Older children and adults with clear signs of bacterial infection are more likely to receive it. Your doctor will also ask about your symptoms — how long they have lasted, whether you have fever, and whether you have taken antibiotics recently.
If you have a history of allergic reactions to penicillin or amoxicillin, your doctor will not prescribe it. Amoxicillin is a type of penicillin antibiotic, so a true allergy to one means you cannot take the other. Tell your doctor about any rash, swelling, or difficulty breathing you have had after taking penicillin-based drugs.
How amoxicillin is dosed and how long it takes to work
Amoxicillin comes as a liquid for children and as tablets or capsules for adults. The dose depends on your age and weight. For children, the typical dose is 20 to 40 milligrams per kilogram of body weight per day, split into two or three doses. Adults usually take 250 to 500 milligrams three times daily. Your doctor or pharmacist will tell you the exact dose and how often to take it.
You should notice improvement within two to three days — pain and fever usually decrease first. However, you must take the full course of amoxicillin, even if you feel better. The course is typically seven to ten days. Stopping early can allow bacteria to survive and multiply, leading to a return of infection or to antibiotic resistance, which makes the bacteria harder to treat in the future.
Take amoxicillin at the same times each day to keep a steady level of the drug in your body. If you miss a dose, take it as soon as you remember, unless it is almost time for the next dose. Do not double up on doses.
What happens if amoxicillin does not work
If your symptoms do not improve after three days of amoxicillin, or if they get worse, contact your doctor. This can mean the bacteria causing your infection is resistant to amoxicillin, or that the infection is viral rather than bacterial. Your doctor may switch you to a different antibiotic, such as azithromycin or amoxicillin-clavulanate (which combines amoxicillin with a substance that overcomes some types of resistance).
Some ear infections need imaging or further testing if they do not respond to a first antibiotic. Your doctor may order a CT scan or refer you to an ear, nose, and throat specialist (an otolaryngologist) if the infection is severe, recurrent, or affecting your hearing.
Side effects and what to watch for
Common side effects of amoxicillin include nausea, vomiting, diarrhea, and rash. These are usually mild and go away after you finish the course. Taking amoxicillin with food can reduce nausea. If you develop diarrhea, drink plenty of fluids and do not stop taking the antibiotic unless your doctor tells you to.
Serious allergic reactions are rare but can happen. Seek immediate medical attention if you develop a severe rash, swelling of the face or throat, difficulty breathing, or signs of anaphylaxis (dizziness, rapid heartbeat, loss of consciousness). These are medical emergencies.
Some people develop a yeast infection while taking amoxicillin because the antibiotic kills helpful bacteria along with harmful ones. If you notice unusual discharge or itching, tell your doctor.
Pain relief while taking amoxicillin
Amoxicillin treats the infection, but it does not immediately stop pain. While the antibiotic works, you can use over-the-counter pain relievers to feel better. Ibuprofen and acetaminophen both reduce ear pain and fever. Follow the dosing instructions on the package for your age and weight. Do not exceed the maximum daily dose.
A warm compress held against the outside of your ear can also ease discomfort. Some people find relief by lying on the unaffected side. Avoid inserting anything into your ear canal, including cotton swabs, as this can worsen irritation.
When ear infections do not need amoxicillin
Not every ear infection requires antibiotics. Many ear infections, especially in children, are viral and resolve on their own within a week or two. Your doctor may recommend a "wait and see" approach, treating pain and fever while your immune system fights the infection. This approach reduces unnecessary antibiotic use and the risk of resistance.
Outer ear infections (swimmer's ear) are usually treated with antibiotic ear drops rather than oral amoxicillin. Viral ear infections do not respond to any antibiotic and must run their course. Your doctor will help you decide whether amoxicillin is necessary for your specific situation.
Frequently Asked Questions
How long does amoxicillin take to stop ear pain?
Pain usually begins to decrease within two to three days, though some people notice relief within 24 hours. Full improvement may take longer. Use over-the-counter pain relievers alongside amoxicillin for faster relief while the antibiotic works.
Can I stop taking amoxicillin once I feel better?
No. You must take the full course, even if symptoms disappear. Stopping early allows bacteria to survive and multiply, which can bring the infection back and create antibiotic-resistant strains that are harder to treat.
What should I do if I am allergic to penicillin?
Tell your doctor before they prescribe amoxicillin. Amoxicillin is a penicillin-based antibiotic, so a true allergy to penicillin means you cannot take amoxicillin. Your doctor will prescribe a different antibiotic instead.
Can amoxicillin treat a viral ear infection?
No. Amoxicillin only works against bacteria. If your ear infection is viral, antibiotics will not help. Your doctor will determine whether your infection is bacterial or viral during an exam and recommend the right treatment.
What if amoxicillin does not work after a few days?
Contact your doctor. They may switch you to a different antibiotic, order tests to identify the bacteria, or refer you to a specialist. Do not stop taking amoxicillin on your own — wait for your doctor's instructions.