Pediatric Nausea/Vomiting: Which is the maximum Zofran dose?

Pediatric Nausea/Vomiting: Which is the maximum Zofran dose?

• A. 4 mg
• B. 8 mg
• C. 2 mg
• D. 6 mg

Answer: (A)

Pediatric dosing of ondansetron uses a per-dose ceiling to limit the risk of QT interval prolongation. The usual approach is 0.15 mg/kg per dose, with a maximum of 4 mg per single dose. So the highest amount you would give in one administration for a child is 4 mg. For example, a child weighing 20 kg would receive about 3 mg per dose, but you would not exceed 4 mg at any one time. Dosing can be repeated every 4–6 hours as needed, though many protocols also cap the total daily amount to avoid cumulative cardiac risk. That’s why 4 mg is the best answer. The other options don’t fit the standard per-dose maximum (8 mg or 6 mg would be higher than the typical single-dose cap) or are below the usual per-dose amount (2 mg), so they’re not the standard maximum per administration.

Pediatric dosing of ondansetron uses a per-dose ceiling to limit the risk of QT interval prolongation. The usual approach is 0.15 mg/kg per dose, with a maximum of 4 mg per single dose. So the highest amount you would give in one administration for a child is 4 mg. For example, a child weighing 20 kg would receive about 3 mg per dose, but you would not exceed 4 mg at any one time. Dosing can be repeated every 4–6 hours as needed, though many protocols also cap the total daily amount to avoid cumulative cardiac risk. That’s why 4 mg is the best answer. The other options don’t fit the standard per-dose maximum (8 mg or 6 mg would be higher than the typical single-dose cap) or are below the usual per-dose amount (2 mg), so they’re not the standard maximum per administration.