A nurse is preparing to administer chlorpromazine 0.55 mg/kg IM to a child who weighs 66 lb. Available is chlorpromazine 25 mg/mL for injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Convert the child's weight from pounds to kilograms: There are 2.205 pounds in 1 kilogram. Divide: 66 lb / 2.205 lb/kg = 30 kg. Determine the total dosage: The child is prescribed 0.55 mg/kg of chlorpromazine. The child weighs 30 kg. Total dosage is 0.55 mg/kg x 30 kg = 16.5 mg. Determine the volume per dose: The chlorpromazine injection contains 25 mg per mL. The nurse needs to administer 16.5 mg per dose. Divide 16.5 mg / 25 mg per mL = 0.66 mL per dose. = 0.7 mL per dose.