A nurse is preparing to administer chlorpromazine 0.55 mg/kg IM every 6 hr to a child who weighs 44 lb. Available is chlorpromazine 25 mg/mL injection. 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.)

Here's how we can calculate it: 1. Convert child's weight to kilograms (kg): We know 1 lb is equal to 0.453592 kg. Child's weight (kg) = 44 lb x 0.453592 kg/lb = 20 kg (rounded to two decimal places) 2. Calculate the total chlorpromazine dosage: Dosage (mg) = Weight (kg) x Dosage per kg (mg/kg) Dosage (mg) = 20 kg x 0.55 mg/kg Dosage (mg) = 11 mg (rounded to two decimal places) 3. Determine the volume to administer (considering the available concentration): Concentration (mg/mL) = 25 mg/mL (given) Volume (mL) = Dosage (mg) / Concentration (mg/mL) Volume (mL) = 11 mg / 25 mg/mL Volume (mL) = 0.44 mL (rounded to two decimal places) 4. Round the answer to the nearest tenth: Due to medication accuracy practices, rounding to the nearest whole number (0 mL) might not be appropriate in this case. Rounded volume to administer = 0.4 mL Therefore, the nurse should administer 0.4 mL of chlorpromazine per dose.