A nurse is preparing to administer digoxin 12 mcg/kg/day PO to divide equally every 12 hr to a school-age child who weighs 66 lb. Available is digoxin elixir 0.05 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Step 1: Convert the child’s weight from pounds to kilograms. 66 lb ÷ 2.2 = 30 kg Step 2: Calculate the total daily dose of digoxin. 12 mcg/kg/day × 30 kg = 360 mcg/day Step 3: Divide the total daily dose by 2 to get the dose for every 12 hours. 360 mcg/day ÷ 2 = 180 mcg/dose Step 4: Convert mcg to mg. 180 mcg = 0.18 mg Step 5: Calculate the volume to administer per dose using the concentration of the elixir. 0.18 mg ÷ 0.05 mg/mL = 3.6 mL Final calculated answer: 3.6 mL per dose.