Ondansetron pediatric dose
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ondansetron pediatric dosing guidelines 2024 mg/kg
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Ondansetron Pediatric Dosing
Ondansetron is a selective 5-HT3 serotonin receptor antagonist used to prevent and treat nausea and vomiting in children. Dosing varies by indication, age/weight, and route.
Acute Gastroenteritis / General Nausea & Vomiting (Emergency Use)
This is one of the most common pediatric uses. The Canadian Paediatric Society and most ED protocols recommend a single weight-based dose:
| Weight | Oral Dose |
|---|---|
| 8-15 kg | 2 mg |
| 15-30 kg | 4 mg |
| > 30 kg | 6-8 mg |
- Universal weight-based formula: 0.15 mg/kg PO, max single dose 8 mg
- Age cutoff: >6 months
- A single dose is preferred - multi-dose therapy has not shown added benefit for gastroenteritis
- Start oral rehydration therapy 15-30 minutes after dose
Chemotherapy-Induced Nausea & Vomiting (CINV)
FDA-approved oral dosing for moderately emetogenic chemotherapy (ages 4 and older):
| Age | Dose | Frequency |
|---|---|---|
| 4-11 years | 4 mg | 30 min before chemo, then 4 mg at 4 h and 8 h; then every 8 h x 1-2 days |
| ≥12 years | 8 mg | 30 min before chemo, then 8 h after; then every 12 h x 1-2 days |
- For highly emetogenic chemotherapy, a 24 mg single dose may be used in adolescents ≥12 years
IV / Parenteral Dosing
| Indication | Dose | Max |
|---|---|---|
| General pediatric N/V | 0.1-0.15 mg/kg IV | 4 mg/dose (young/small children) |
| Older children / adolescents | 4-8 mg IV | 8 mg/dose |
| Postoperative N/V | 0.1 mg/kg IV (≤40 kg); 4 mg IV (>40 kg) | 4 mg |
- Give IV doses slowly over at least 30 seconds (minimum), ideally 2-5 minutes
- Onset: 1-3 minutes IV, 30-60 minutes oral
Postoperative Nausea & Vomiting (PONV)
- Children are at elevated risk for PONV (higher than adults after age 2), especially with ENT, ophthalmic, and strabismus surgery
- IV ondansetron 0.1 mg/kg (up to 4 mg) given at end of surgery is standard prophylaxis
- (Barash Clinical Anesthesia, 9e)
Key Safety Notes
- QT prolongation: Ondansetron prolongs the QT interval - use caution with congenital long QT, hypokalemia, or co-administration of other QT-prolonging drugs
- Diarrhea is the most common side effect in children (especially with gastroenteritis)
- Not routinely recommended when diarrhea is the predominant GI symptom
- Serotonin syndrome risk with concurrent serotonergic drugs
- The FDA does not approve ondansetron for radiation-induced or post-surgical N/V in children under 2 years - doses in this age group should be determined by the treating physician
Sources: Canadian Paediatric Society position statement on oral ondansetron for acute gastroenteritis; Tintinalli's Emergency Medicine; Barash Clinical Anesthesia 9e; FDA prescribing information (GoodRx/Mayo Clinic verified, Nov 2024)
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