Pediatric calculations: Because children come in all sizes, dosages are calculat

Question

Pediatric calculations: Because children come in all sizes, dosages are calculated by weight, rather than age. Actually, this method is used for other special populations as well, particularly for patients in intensive care units. Sometimes Body Surface Area (BSA) is used. Use weight in kilograms (kg), remembering that 1 kg 2.2 pounds (lb). 1. Order: Amoxicillin oral suspension drops 120 mg PO q8h o Child is 1 year old and weighs 27 lb o Usual safe doase range: 20 to 40 mg/kg/day o Supply: Amoxicillin 250 mg/5mL o What is the child's weight in kg? o What is the usual safe dose range for this child? o Is the prescribed dose safe? o Give: mL 2. Order: Cephalexin Suspension 200 mg PO q6h o Child is 8 years old and weighs 55 lb o Usual safe dose range is 25 to 50 mg/kg/day in divided doses o Supply: 250 mg/5 ml o What is the child's weight in kg? o What is the usual safe dose range for this child? o Is the prescribed dose safe? o Give: mL

Explanation / Answer

case one: childs weight in kg=27/2.2=12.27 kg

in this case the safe dose will be 240mg/day to 480mg/day

And prescribed dose is 120mg PO q8H

MEANS 360mg per day

this dose is then safe

calculation in ml=5/25o *360=7ml

case second:

childs weight in kg= 55/2.2=25 kg

Usual safedose will then be=625mg/day to 1250mg/day

here is200mgpo q6h

means 800 mg per day

it is safe dose here

iml =50mg

800mg= 1/50*800=16 ml

Give 16 ml

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