A nurse is reviewing a new prescription for dexamethasone 0.2 mg/kg/day PO in two divided doses for a child who weighs 66 lb. The amount available is dexamethasone 0.5 mg/5 mL elixir. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Calculation: Convert the child's weight from pounds (lb) to kilograms (kg) using the conversion factor of 2.2 lb/kg. Patient's weight in kg = 66 lb / 2.2 lb/kg = 30 kg. Calculate the total daily dose in milligrams (mg). Total daily dose = Ordered dose (mg/kg/day) × Patient's weight (kg) = 0.2 mg/kg/day × 30 kg = 6 mg/day. Calculate the dose per administration (in two divided doses). Dose per administration = Total daily dose (mg/day) / 2 doses/day = 6 mg / 2 = 3 mg/dose. The available concentration is 0.5 mg in 5 mL. = 0.5 mg / 5 mL = 0.1 mg/mL. Calculate the volume in milliliters (mL) to administer per dose. Volume (mL) = Dose per administration (mg) / Concentration (mg/mL) = 3 mg / 0.1 mg/mL = 30 mL.