A nurse is preparing to administer clindamycin phosphate IM 15 mg/kg/day divided in equal doses every 6 hr to an infant who weighs 21 lb. Available is clindamycin phosphate injection 150 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)

Calculation: Convert the infant's weight from pounds (lb) to kilograms (kg) using the conversion factor of 2.2 lb/kg. Patient's weight in kg = 21 lb / 2.2 lb/kg = 9.5454 kg. Calculate the total daily dose in milligrams (mg). Total daily dose = Ordered dose (mg/kg/day) × Patient's weight (kg) = 15 mg/kg/day × 9.5454 kg = 143.181 mg/day. Calculate the dose per administration (every 6 hr, which is 4 doses per day). Dose per administration = Total daily dose (mg/day) / 4 doses/day = 143.181 mg / 4 = 35.795 mg/dose. Available concentration = 150 mg/mL. Calculate the volume in milliliters (mL) to administer per dose. Volume (mL) = Dose per administration (mg) / Available concentration (mg/mL) = 35.795 mg / 150 mg/mL = 0.2386 mL. Round the answer to the nearest hundredth. = 0.24 mL.