Amoxicillin Pediatric Dosage

Calculate weight-based antibiotic doses for children.

âš ï¸ Medical Disclaimer

This calculator is for educational and verification purposes only. It does not replace professional medical advice. Always confirm dosages with a pharmacist or physician before administering medication to a child. Incorrect dosing can lead to treatment failure or toxicity.

Pediatric Amoxicillin Dosing: A Parent's Guide

Amoxicillin is one of the most commonly prescribed antibiotics for children. It belongs to the penicillin family and is effective against a wide range of bacterial infections, including ear infections (otitis media), strep throat, and pneumonia. Unlike adult medications given in fixed pills, pediatric doses are carefully calculated based on the child's body weight to ensure safety and efficacy.

How is the Dose Calculated?

Doctors prescribe amoxicillin in milligrams per kilogram of body weight per day (mg/kg/day). This total daily amount is then divided into 2 or 3 doses (every 12 hours or every 8 hours).

Two Common Dosing Strategies:
1. Standard Dose (20-40 mg/kg/day):
Used for general infections like mild throat infections, skin infections, or routine dental prophylaxis.
Example: A 10kg child usually gets 200mg to 400mg per day total.

2. High Dose (80-90 mg/kg/day):
Specifically recommended by the American Academy of Pediatrics (AAP) for Acute Otitis Media (Ear Infections) and resistant pneumonia. This higher concentration is needed to overcome antibiotic-resistant bacteria like Streptococcus pneumoniae.
Example: That same 10kg child would get 800mg to 900mg per day total.

Frequency: Twice or Three Times a Day?

BID (Twice Daily / q12h): The total daily dose is divided by 2. This is convenient for parents (giving meds before school and before bed).
TID (Three Times Daily / q8h): The total daily dose is divided by 3. This maintains a more steady level of antibiotic in the blood but can be harder to schedule.

Common Suspension Concentrations

Liquid amoxicillin comes in different strengths. Check your bottle carefully!

125 mg / 5 mL: Often standard concentration.
200 mg / 5 mL: Often used for BID dosing.
250 mg / 5 mL: Stronger standard concentration.
400 mg / 5 mL: "Extra strength," typically for BID high-dose regimens.

Confusing the bottles (e.g., using 400mg/5mL when the math was done for 250mg/5mL) is a common cause of overdose.

Safety Tips

- Shake Well: Suspensions settle. Shake the bottle vigorously before every dose.
- Use a Syringe: Never use a kitchen spoon. Use the oral syringe or cup provided by the pharmacy for accuracy.
- Finish the Course: Even if your child feels better in 2 days, finish the full 5, 7, or 10-day course as prescribed to prevent resistance.
- Allergies: If your child develops a rash, trouble breathing, or swelling, stop immediately and seek emergency care. This could be a penicillin allergy.