The provider prescribed penicillin G 100,000 units IM every 12 hours. The medication is available in solution as 250,000 units/mL. The nurse should administer _______ mL every 12 hours. (Round your answer to the nearest tenth. Do not include a label with your answer.)

Calculation: Identify the ordered dose and available concentration Ordered Dose: 100,000 units Available Concentration: 250,000 units/mL Calculate the volume to administer Volume to administer = Ordered Dose ÷ Concentration Volume to administer = 100,000 ÷ 250,000 = 0.4 mL