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.)

Rationale: Step 1: Convert weight from pounds to kilograms: 66 lb ÷ 2.2 = 30 kg Step 2: Calculate total daily dose in mcg: 12 mcg/kg/day × 30 kg = 360 mcg/day Step 3: Divide for every 12 hr (2 doses/day): 360 ÷ 2 = 180 mcg per dose Step 4: Convert mcg to mg: 180 mcg ÷ 1000 = 0.18 mg Step 5: Determine mL per dose using available concentration: 0.05 mg : 1 mL = 0.18 mg : X mL Cross multiply: 0.05 × X = 0.18 × 1 0.05X = 0.18 X = 0.18 ÷ 0.05 = 3.6 mL