A patient weighing 75 kg is prescribed intravenous phenytoin 1500 mg . Over how many minutes can…

➤ How do I calculate infusion time for other phenytoin doses while respecting the 50 mg/min limit?
Use the formula time (minutes) = total dose (mg) ÷ infusion rate (mg/min). Always cap the adult phenytoin rate at 50 mg/min. For example, 800 mg ÷ 50 mg/min = 16 minutes. Verify units, dilution volume, compatibility, and monitor for adverse effects throughout the infusion.