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: Calculate the total daily dose of digoxin: 12 mcg/kg/day * 30 kg = 360 mcg/day Step 2: Calculate the dose per administration: Since the dose is to be divided equally every 12 hours, each dose will be half of the total daily dose: 360 mcg/day / 2 = 180 mcg/dose Step 3: Convert mcg to mg: 180 mcg = 0.18 mg Step 4: Calculate the volume to administer: We know that 0.05 mg of digoxin is contained in 1 mL of the elixir. So, to find the volume for 0.18 mg, we can set up a proportion: 0.05 mg / 1 mL = 0.18 mg / x mL Cross-multiplying: 0.05x = 0.18 Solving for x: x = 0.18 / 0.05 = 3.6 mL