The recommended dose of amoxicillin for a child that age is:
Infants 3 months of age and older and children weighing up to 40 kg (88 lbs.)—Dose is based on body weight and must be determined by your doctor. The usual dose is 6.7 to 13.3 mg per kg (3 to 6 mg per pound) of body weight every eight hours or 12.5 to 22.5 mg per kg (5.7 to 10.2 mg per pound) of body weight every twelve hours.
So for this child weighing 21 lbs the maximum dose should be:
- 126mg every 8 hours OR
- 214mg every 12 hours.
I'm not really sure about 400mg - Did you mean that as a daily dose?
- Amoxicillin Information for Consumers
- Amoxicillin Information for Healthcare Professionals (includes dosage details)
- Side Effects of Amoxicillin (detailed)
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