Amox dose for 31 kg weight
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Here is the complete amoxicillin dosing guide for a 31 kg child, sourced from textbook references:
Amoxicillin Dose - 31 kg Child
Standard Dose
- 25-50 mg/kg/day divided every 8 hours (q8h) or every 12 hours (q12h)
- For 31 kg: 775 mg/day - 1,550 mg/day
| Dosing range | Total daily dose | Per dose (q8h) | Per dose (q12h) |
|---|---|---|---|
| Low (25 mg/kg/day) | 775 mg/day | ~250 mg q8h | ~390 mg q12h |
| Mid (40 mg/kg/day) | 1,240 mg/day | ~400 mg q8h | ~625 mg q12h |
| High (50 mg/kg/day) | 1,550 mg/day | ~500 mg q8h | ~775 mg q12h |
Practical Dosing by Indication
| Indication | Dose | For 31 kg | Practical Rx |
|---|---|---|---|
| Pharyngitis (Group A Strep) | 25 mg/kg twice daily | ~775 mg/day | 250 mg q8h or 400 mg q12h |
| Otitis media (standard) | 40 mg/kg/day div q8-12h | ~1,250 mg/day | 400-500 mg q8h |
| AOM (high-dose, resistant organisms) | 80-90 mg/kg/day div q8-12h | ~2,500-2,800 mg/day | 875 mg q12h (use adult tab) |
| Community-acquired pneumonia | 80-90 mg/kg/day | ~2,500 mg/day | 875 mg q12h |
| Endocarditis prophylaxis | 50 mg/kg single dose | ~1,550 mg | 1,500 mg (single dose pre-procedure) |
Key Points
- Max dose: 3,000-4,000 mg/day depending on indication (adult cap applies)
- At 31 kg, the child is approaching adult weight thresholds - for high-dose regimens, adult tablet doses (500 mg or 875 mg) become practical
- Oral suspension is available as 125 mg/5 mL, 200 mg/5 mL, 250 mg/5 mL, or 400 mg/5 mL - choose concentration to keep volume manageable
- Amoxicillin is safe in children; adjust dose if renal impairment
(Dosing data from Dermatology 2-Volume Set 5e and Goodman & Gilman's Pharmacological Basis of Therapeutics)
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