Ondansetron Pediatric Dosage Calculator
Antiemetic dosing for chemotherapy-induced, post-operative, and gastroenteritis-related nausea and vomiting in children.
Weight in kilograms
Age in years
Reason for antiemetic
⚠️ Warnings & Contraindications
- Risk of QT prolongation - obtain ECG if patient has cardiac disease or electrolyte abnormalities
- Headache is the most common side effect
- Constipation may occur
- For gastroenteritis, give smallest effective dose to prevent hospitalization
- Not effective for motion sickness
- Serotonin syndrome risk when combined with other serotonergic drugs
ℹ️ Clinical Notes
Oral solution: 4 mg/5 mL. ODT tablets: 4 mg, 8 mg. IV: 2 mg/mL. ODT should not be pushed through foil backing. For children unable to swallow tablets, oral solution is preferred.
References
- Ondansetron pediatric dosing - Drugs.com (2026)
- Ondansetron for acute gastroenteritis in children - AAP/Pediatrics (2020)
Medical Disclaimer
This calculator is provided for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or calculated using this tool.
The authors and publishers of this calculator make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability, or availability of the information, products, services, or related graphics contained within this tool for any purpose.