Ondansetron 4 mg/5 mL Dosage Calculator

How to Calculate Ondansetron 4 mg/5 mL Dose

This calculator determines the Ondansetron dose for treating nausea and vomiting, particularly in gastroenteritis, using a concentration of Ondansetron 4 mg/5 mL (0.8 mg/mL), based on the patient’s weight:

Dose in mL and mg (based on Ondansetron):

Pediatric ≥6 months and ≥8 kg (for gastroenteritis):

8 to 15 kg: 2.5 mL (2 mg) PO once
15 to 30 kg: 5 mL (4 mg) PO once
≥30 kg: 10 mL (8 mg) PO once

Where:

Weight: Enter the patient’s weight in kilograms (kg) or pounds (lb) and select the unit from the dropdown (automatically converted to kg).
Concentration: Ondansetron 4 mg/5 mL (0.8 mg/mL).

Administer as prescribed for nausea/vomiting, particularly in gastroenteritis. ⚠️ Note: Routine use of Ondansetron is not recommended in most cases of acute gastroenteritis. Always consult a healthcare provider.

Using the Ondansetron 4 mg/5 mL Dosage Calculator

Enter the patient’s weight in kilograms or pounds, select the unit, and click "Calculate." The calculator provides the dose in mL and mg (Ondansetron) for pediatric patients (≥6 months and ≥8 kg) with gastroenteritis.

Example: Weight 25 kg:

Pediatric dose ≥6 months (15 to 30 kg):
5 mL (4 mg) PO once

Calculations must be re-checked and should not be used alone...

Consult a healthcare provider before administering, and note that routine use is not recommended in most cases of acute gastroenteritis.

Frequently Asked Questions (FAQ)

1. What is Ondansetron used for?

Ondansetron (Zofran) is used to prevent nausea and vomiting caused by chemotherapy, radiation therapy, or surgery, and in some cases, gastroenteritis.

2. How often is this given for gastroenteritis?

Pediatric ≥6 months and ≥8 kg (for gastroenteritis): 2 mg, 4 mg, or 8 mg PO once, based on weight (8–15 kg, 15–30 kg, or ≥30 kg, respectively).

3. Can this be used for infants under 6 months?

Consult a doctor, as Ondansetron is not typically recommended for infants under 6 months without medical supervision.

4. What if weight is in pounds?

Enter the weight in pounds, and the calculator will automatically convert it to kilograms for calculation (1 lb = 0.4536 kg approximately).

5. Why is routine use not recommended for gastroenteritis?

Routine use of Ondansetron is not recommended in most cases of acute gastroenteritis due to potential risks and lack of consistent benefit, as per clinical guidelines.