Pediatric mg/kg dose practice problems
Work each problem on paper first, rounding as the question says. Then open the answer to check it and see every step.
For study and exam practice, not for patient care. The orders in these problems are written for practice. In the clinic, follow the prescriber's order, your facility's protocols, and your pharmacy.
Problem 1
The nurse is caring for a client who has a prescription for amoxicillin 25 mg/kg/day PO divided every 12 hours. The client is an 18-month-old toddler who weighs 10.6 kg. How many mg should the nurse administer per dose? Record your answer using 1 decimal place.
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Answer: 132.5 mg
- Daily dose = 25 mg/kg/day × 10.6 kg = 265 mg/day.
- Divided every 12 hours is 2 doses a day: 265 ÷ 2 = 132.5 mg per dose.
- 132.5 mg is exact, so no rounding is needed.
Problem 2
Order: amoxicillin 25 mg/kg/day PO divided every 12 hours. The client is an 18-month-old toddler who weighs 8.8 kg. How many mg should the nurse administer per dose? Record your answer using a whole number.
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Answer: 110 mg
- Daily dose = 25 mg/kg/day × 8.8 kg = 220 mg/day.
- Divided every 12 hours is 2 doses a day: 220 ÷ 2 = 110 mg per dose.
- 110 mg is exact, so no rounding is needed.
Problem 3
Order: amoxicillin 45 mg/kg/day PO divided every 12 hours. The client is a 15-month-old toddler who weighs 10.6 kg. How many mg should the nurse administer per dose? Record your answer using 1 decimal place.
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Answer: 238.5 mg
- Daily dose = 45 mg/kg/day × 10.6 kg = 477 mg/day.
- Divided every 12 hours is 2 doses a day: 477 ÷ 2 = 238.5 mg per dose.
- 238.5 mg is exact, so no rounding is needed.
Problem 4
A pediatric unit is caring for a client who is receiving ondansetron to prevent nausea and vomiting after a procedure. Order: ondansetron 0.1 mg/kg/dose IV once. The client is a 9-month-old infant who weighs 8.5 kg. How many mg should the nurse administer per dose? Record your answer using 2 decimal places.
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Answer: 0.85 mg
- Dose = 0.1 mg/kg × 8.5 kg = 0.85 mg.
- 0.85 mg is exact, so no rounding is needed.
Problem 5
Order: azithromycin 12 mg/kg/dose PO daily. The client is an 11-year-old who weighs 39.9 kg. How many mg should the nurse administer per dose? Record your answer using 1 decimal place.
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Answer: 478.8 mg
- Dose = 12 mg/kg × 39.9 kg = 478.8 mg.
- 478.8 mg is exact, so no rounding is needed.
Problem 6
Order: acyclovir 20 mg/kg/dose IV every 8 hours. The client is a 7-year-old who weighs 25 kg. How many mg should the nurse administer per dose? Record your answer using a whole number.
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Answer: 500 mg
- Dose = 20 mg/kg × 25 kg = 500 mg.
- 500 mg is exact, so no rounding is needed.
Problem 7
The nurse is caring for a client who is a 7-year-old and weighs 20.6 kg. The nurse has an order for amoxicillin 45 mg/kg/day PO divided every 12 hours. How many mg should the nurse administer per dose? Record your answer using 1 decimal place.
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Answer: 463.5 mg
- Daily dose = 45 mg/kg/day × 20.6 kg = 927 mg/day.
- Divided every 12 hours is 2 doses a day: 927 ÷ 2 = 463.5 mg per dose.
- 463.5 mg is exact, so no rounding is needed.
Problem 8
A 3-month-old infant with a suspected bacterial infection is admitted to the pediatric unit. The provider has written an order for ceftriaxone 100 mg/kg/dose IM once. The infant weighs 5.2 kg. How many mg should the nurse administer per dose? Record your answer using a whole number.
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Answer: 520 mg
- Dose = 100 mg/kg × 5.2 kg = 520 mg.
- 520 mg is exact, so no rounding is needed.
Problem 9
Order: azithromycin 10 mg/kg/dose PO daily. The client is a 12-year-old who weighs 32.8 kg. How many mg should the nurse administer per dose? Record your answer using a whole number.
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Answer: 328 mg
- Dose = 10 mg/kg × 32.8 kg = 328 mg.
- 328 mg is exact, so no rounding is needed.
Problem 10
The nurse is caring for a client who has a prescription for acyclovir 10 mg/kg/dose IV every 8 hours. The client is an 18-month-old toddler who weighs 10.4 kg. How many mg should the nurse administer per dose? Record your answer using a whole number.
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Answer: 104 mg
- Dose = 10 mg/kg × 10.4 kg = 104 mg.
- 104 mg is exact, so no rounding is needed.
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