Paediatric doses of common antibiotics

ORAL doses of commonly prescribed antibiotics†.

easidose-oral-syringe-5ml

Amoxicillin
Age Dose (3x daily) Maximum dose (3x daily)
Neonate (7-28 days) 30mg/kg 125mg
1- 11 months 125 mg up to 30 mg/kg
 1–4 years 250 mg up to 30 mg/kg
 5–11 years 500 mg up to 30 mg/kg (up to 1 g)
12–17 years 500 mg up to 1 g
Reference: BNFC, 2017

Clarithromycin
Ages 1 month -11 years Dose (2x daily)
Neonate 7.5 mg/kg
Up to 8 kg 7.5 mg/kg
8-11 kg 62.5 mg
12-19 kg 125 mg
20-29 kg 187.5 mg
30-40 kg 250 mg
Age Dose (2x daily)
12-17 years 250-500 mg
Reference: BNFC, 2017

Erythromycin
Age Dose Maximum dose
Neonate 12.5 mg/kg every 6 hrs
1 month–1 year 125 mg FOUR times daily* 250 mg FOUR times daily*
2-7 years 250 mg FOUR times daily* 500 mg FOUR times daily*
 8–17 years 250-500 mg FOUR times daily* 1000 mg FOUR times daily*
* The daily dose can be given in two divided doses.  
Reference: BNFC, 2017

Flucloxacillin
Age Dose
Neonate up to 6 days 25 mg/kg TWICE daily
Neonate 7-20 days 25 mg/kg THREE times daily
Neonate 21-28 days 25 mg/kg FOUR times daily
1 month-1 year 62.5-125 mg FOUR times daily
2-9 years 125-250 mg FOUR times daily
10-17 years 250-500 mg FOUR times daily
Reference: BNFC, 2017

Phenoxymethylpencillin
Age Dose (4x daily) Maximum dose (4x daily)
1 –11 months  62.5 mg up to 12.5 mg/kg
 1–5 years 125 mg up to 12.5 mg/kg
 6–11 years 250 mg up to 12.5 mg/kg
12–17 years 500 mg up to 1 g
Reference: BNFC, 2017

Trimethoprim
Age Dose/kg
Neonate Initially 3 mg/kg for ONE dose, then 1-2 mg/kg TWICE daily
4-5 weeks 4 mg/kg TWICE daily (maximum 200 mg per dose)
6 weeks-5 months 4 mg/kg TWICE daily (maximum 200 mg per dose), or 25 mg TWICE DAILY
6 months-5 years 4 mg/kg TWICE daily (maximum 200 mg per dose), or 50 mg TWICE DAILY
6-11 years 4 mg/kg TWICE daily (maximum 200 mg per dose), or 100 mg TWICE DAILY
12-17 years 200 mg TWICE daily
Reference: BNFC, 2017

Age/weight/height table for dosage calculations
Age Weight (kg) Height (cm)
Full-term neonate 3.5 51
1 month 4.3 55
2 months 5.4 58
3 months 6.1 61
4 months 6.7 63
6 months 7.6 67
1 year 9 75
3 years 14 96
5 years 18 109
7 years 23 122
10 years 32 138
12 years 39 149
14 year old boy 49 163
14 year old girl 50 159
Reference: BNFC, 2017

This information is intended as a guide, and while every care has been taken to ensure that it is accurate, it is not a substitute for your professional judgement and obligations.

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