Hesi rn dosage calculation proctored exam
Calculation
A child with a seizure disorder receives a prescription for phenytoin 20 mg by mouth (PO) every 8 hours. The suspension is available in 125 mg/5 mL. How many mL should the nurse administer? (Enter the numerical value only. If rounding is required, round to the nearest tenth.)
mL
Explanation & Rationale
Calculation: Desired dose = 20 mg Available concentration = 125 mg / 5 mL Calculate the volume to administer: Volume to administer (mL) = Desired dose (mg) / Available concentration (mg/mL) = 20 mg / (125 mg / 5 mL) = 20 mg / 25 mg/mL = 0.8 mL
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