A nurse is preparing to administer tobramycin 3 mg/kg/day IM in three divided doses to a client who weighs 85 kg. The amount available is tobramycin 40 mg/mL. 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.)

Calculation: Identify the prescribed dose and client weight Prescribed Dose: 3 mg/kg/day Client Weight: 85 kg Calculate the total daily dose Total Daily Dose = 3 × 85 Total Daily Dose = 255 mg/day Divide the total daily dose into 3 equal doses Dose per Administration = 255 ÷ 3 Dose per Administration = 85 mg per dose Identify the available concentration Available Concentration: 40 mg/mL Calculate the volume to administer per dose Volume to administer = Dose per Administration ÷ Concentration Volume to administer = 85 ÷ 40 Volume to administer ≈ 2.125 mL Round to the nearest tenth = 2.1 mL