A nurse is preparing to administer verapamil 10 mg IV bolus. Available is verapamil injection 5 mg/2 mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Desired dose = 10 mg. Available concentration = 5 mg / 2 mL. Calculate the volume to administer. Volume (mL) = Desired dose (mg) / (Available concentration (mg) / Available volume (mL)) = 10 mg / (5 mg / 2 mL) = 10 mg × (2 mL / 5 mg) = (10 × 2) / 5 mL = 20 / 5 mL = 4 mL.