A nurse is preparing to administer phenobarbital 2 mg/kg/day IV divided in 2 equal doses to a client who weighs 165 lb. Available is phenobarbital 65 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: Convert the client’s weight from pounds to kilograms Weight = 165 ÷ 2.2 ≈ 75 kg Calculate the total daily dose in mg Total Daily Dose = 2 × 75 Total Daily Dose = 150 mg/day Divide the total daily dose into 2 equal doses Dose per Administration = 150 ÷ 2 Dose per Administration = 75 mg per dose Identify the available concentration Available Concentration: 65 mg/mL Calculate the volume to administer per dose Volume to administer = Dose per Administration ÷ Concentration Volume to administer = 75 ÷ 65 Volume to administer ≈ 1.1538 mL Round to the nearest tenth = 1.2 mL