A nurse is preparing to administer digoxin 8 mcg/kg/day PO to divide equally every 12 hr for a preschooler who weighs 33 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 use a trailing zero.)

Given: Desired dose: Digoxin 8 mcg/kg/day PO, divided equally every 12 hours Child's weight: 33 lb Available concentration: Digoxin elixir 0.05 mg/mL To find: Volume to administer per dose (in mL) Step 1: Convert child's weight to kilograms 1 pound (lb) is approximately equal to 0.453592 kilograms (kg). multiply: 33 lb x 0.453592 kg/lb ≈ 14.97 kg Step 2: Calculate the total daily dose of digoxin Total daily dose = Desired dose (mcg/kg/day) x Child's weight (kg) Total daily dose = 8 mcg/kg/day x 14.97 kg = 119.76 mcg/day Step 3: Calculate the dose per administration We divide the total daily dose by 2: Dose per administration = Total daily dose / 2 Dose per administration = 119.76 mcg/day / 2 = 59.88 mcg/dose Step 4: Convert desired dose to milligrams 1 milligram (mg) is equal to 1000 micrograms (mcg). divide by 1000: Desired dose (mg) = Desired dose (mcg) / 1000 Desired dose (mg) = 59.88 mcg / 1000 = 0.05988 mg Step 5: Set up the proportion (Desired dose) / (Available concentration) = Volume to administer Step 6: Substitute the values Plugging in the given values, we get: (0.05988 mg) / (0.05 mg/mL) = Volume to administer Step 7: Simplify To simplify, we can invert the denominator and multiply: (0.05988 mg) x (1 mL / 0.05 mg) = Volume to administer The "mg" units cancel out, leaving us with: (0.05988 x 1 mL) / 0.05 = Volume to administer Step 8: Calculate Performing the multiplication and division, we get: 0.05988 mL / 0.05 = Volume to administer 1.1976 mL ≈ Volume to administer Step 9: Round to the nearest tenth 1.2mL