Medically reviewed by Abhijit Bhattacharyya | MD, PhD, MBA, Tufts University School of Medicine - Miami, Florida on November 17th, 2025.
Amoxicillin is among the most commonly prescribed antibiotics worldwide. It belongs to the penicillin family and is effective against a wide range of bacterial infections. Doctors often recommend it for ear infections, throat infections, sinusitis, pneumonia, and urinary tract infections, among others.
Knowing the right dosage of amoxicillin is crucial for treating infections effectively and avoiding resistance or side effects. This guide will help you understand how much amoxicillin to take, when to take it, and what to do if you miss a dose.
Form |
Strength |
Typical Adult Dose |
Typical Children’s Dose |
Frequency |
Route |
Maximum Daily Dose |
|---|---|---|---|---|---|---|
Tablet/Capsule |
250 mg |
250 mg every 8 hours |
20-40 mg/kg/day divided every 8 hours |
3 times daily |
Oral |
3 grams/day |
Tablet/Capsule |
500 mg |
500 mg every 8 hours or 875 mg every 12 hours |
Not typically used |
2-3 times daily |
Oral |
3 grams/day |
Oral Suspension |
125 mg/5 mL |
Not typically used |
20-40 mg/kg/day divided every 8 hours |
3 times daily |
Oral |
Based on weight |
Oral Suspension |
250 mg/5 mL |
Not typically used |
20-40 mg/kg/day divided every 8 hours |
3 times daily |
Oral |
Based on weight |
For adults, the usual dose is 500 mg every 8 hours or 875 mg every 12 hours for 7 to 10 days. Children typically receive 20 to 40 mg per kilogram of body weight per day, divided into three doses. This ensures the infection is cleared effectively.
Adults generally take 500 mg every 8 hours for 7 days. Children’s doses are adjusted by weight, usually 20 to 40 mg/kg/day, divided into three doses. It is important to complete the full course even if symptoms improve early.
Adults may be prescribed 500 mg every 8 hours or 875 mg every 12 hours. Children’s doses follow the same weight-based calculation. Treatment duration varies but typically lasts 7 to 14 days, depending on severity.
Adults usually take amoxicillin in doses ranging from 250 mg to 875 mg per dose, depending on the type and severity of the infection. The medication is most commonly taken two to three times daily. The total daily dose should not exceed 3 grams.
It’s essential to follow your doctor’s instructions carefully. Taking too little may not clear the infection, while too much can increase the risk of side effects.
Children’s doses are calculated based on their weight, typically 20-40 mg/kg/day. This total daily dose is divided into three doses, taken every 8 hours. Pediatric formulations, such as oral suspensions, make it easier to get the correct dose for young children.
Always use the measuring device provided with the medication to ensure accuracy.
If you miss a dose, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue your regular schedule. Do not double-dose to make up for a missed dose, as this can increase side effects.
People with liver or kidney issues may need dose adjustments. These organs help process and clear the drug from the body, so impaired function can cause amoxicillin to build up to harmful levels. Always inform your healthcare provider about any existing conditions before starting treatment.
Amoxicillin is generally considered safe during pregnancy and breastfeeding, but a healthcare professional should carefully manage the dose and duration.
Taking too much amoxicillin can cause nausea, vomiting, diarrhea, and more serious side effects like seizures. If an overdose is suspected, seek emergency medical help immediately.
Do not use amoxicillin if you are allergic to penicillin or any components of the medication. Allergic reactions can be severe and require immediate attention.
Take the medication exactly as prescribed by your doctor.
Complete the full course, even if you start feeling better early.
Take amoxicillin with or without food, but taking it with food may reduce stomach upset.
Store the medication properly, especially liquid forms that may require refrigeration.
Inform your doctor about all other medications you are taking to avoid interactions.
For personalized advice on amoxicillin dosage and other medication questions, Doctronic.ai offers free AI doctor visits that draw on the latest medical research. You can get quick, reliable answers tailored to your health needs anytime.
If you need a telehealth consultation with a licensed doctor, Doctronic also provides affordable video visits 24/7 across all 50 states. This service is perfect for getting prescriptions, dosage adjustments, or second opinions without leaving home.
Yes, amoxicillin can be taken with or without food. However, taking it with food may help reduce stomach upset.
Many people start feeling better within 48 to 72 hours, but it is important to finish the entire prescribed course to fully clear the infection.
No, children’s doses are based on their weight and should be carefully measured to avoid underdosing or overdosing.
If you experience mild side effects like nausea or diarrhea, inform your doctor. For severe reactions such as rash, swelling, or difficulty breathing, seek emergency medical help immediately.
Amoxicillin is generally considered safe during pregnancy, but always consult your healthcare provider before taking any medication.
The Bottom Line About Amoxicillin DosagesAmoxicillin is an effective treatment for bacterial infections when used correctly. Following dosage guidelines ensures the best results and minimizes risks. If you have questions about your dose or need a quick consultation, Doctronic.ai is an excellent resource for personalized, AI-powered medical advice and affordable telehealth visits.
Remember, never self-prescribe or change your dose without consulting a healthcare professional. Proper use of antibiotics protects your health and helps prevent antibiotic resistance.
Amoxicillin is among the most commonly prescribed antibiotics worldwide. It belongs to the penicillin family and is effective against a wide range of bacterial infections. [...]
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