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Ondernsetron pediatric dose

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ondansetron pediatric dose official prescribing information children chemotherapy postoperative nausea vomiting

Ondansetron pediatric dose depends on the indication. Do not use it for an infant or child without confirming the child's weight, age, diagnosis, route, and cardiac risk factors with a clinician.

Acute gastroenteritis vomiting, common ED use

  • 0.15 mg/kg by mouth or IV once
  • Maximum: 8 mg per dose
  • Oral weight-based alternative commonly used:
    • 8-15 kg: 2 mg once
    • 15-30 kg: 4 mg once
    • >30 kg: 6-8 mg once
The usual goal is a single dose to enable oral rehydration, not repeated home dosing unless specifically prescribed. Textbook dosing supports 0.15 mg/kg PO or IV, maximum 8 mg for pediatric vomiting/gastroenteritis. ROSEN's Emergency Medicine Concepts and Clinical Practice, Pediatrics and Management sections.

Chemotherapy-induced nausea/vomiting, oral FDA labeling

  • Age 4-11 years: 4 mg orally 30 minutes before chemotherapy, then 4 mg at 4 and 8 hours; then 4 mg three times daily for 1-2 days.
  • Age 12-17 years: 8 mg on the same schedule.
See the FDA Zofran label.

Important precautions

Avoid or get medical advice first if the child has:
  • Known long-QT syndrome, fainting/palpitations, congenital heart disease
  • Low potassium or magnesium, significant dehydration
  • Other QT-prolonging medicines
  • Severe liver disease, where the total daily dose should not exceed 8 mg
Seek urgent care for bilious green vomit, bloody vomit/stool, severe abdominal pain, lethargy, inability to keep fluids down, or signs of dehydration. A 2026 systematic review assessed QTc effects in children, so cardiac-risk screening remains important (PMID 41880414).
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