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

To calculate the dosage of tobramycin for a client who weighs 85 kg, first we need to find the total daily dose by multiplying the weight by the dose per kg: 85 kg x 3 mg/kg/day = 255 mg/day. Then, we need to divide the total daily dose by the number of doses per day to get the dose per administration: 255 mg/day / 3 doses/day = 85 mg/dose. Finally, we need to use the concentration of the available solution to find the volume per dose by dividing the dose by the concentration: 85 mg/dose / 40 mg/mL = 2.125 mL/dose. The nurse should administer 2.1 mL of tobramycin per dose to the client.