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.)

Step 1: Convert the infant's weight from pounds to kilograms. To convert pounds to kilograms, we use the conversion factor 1 kg = 2.2 lb. Weight in kg= 21/2.2≈9.55 kg Step 2: Calculate the total daily dose of clindamycin in mg. Total dose in mg/day=15 mg/kg/day×9.55 kg=143.25 mg/day Step 3: Divide the total daily dose into 4 equal doses (every 6 hours). We divide the total daily dose by 4: Dose per administration=143.25 mg/4=35.8125 mg/dose Step 4: Determine the volume to administer per dose. The available clindamycin phosphate injection concentration is 150 mg/mL. To determine how many mL the nurse should administer per dose, we use the following formula: Volume (mL)=Dose in mg/Concentration in mg/mL=35.8125 mg/150 mg/mL=0.238 mL Step 5: Round the answer. Rounding off 0.238 mL gives 0.24 mL.