A nurse is preparing to administer Diphenhydramine 50 mg intramuscularly. The available concentration is 100 mg/mL. Calculate the volume in milliliters the nurse should draw up and administer. Round your answer to the nearest tenth.

Calculation: Identify the ordered dose and available concentration Ordered Dose: 50 mg Available Concentration: 100 mg/mL Calculate the volume to administer Volume = Ordered Dose ÷ Concentration Volume = 50 ÷ 100 = 0.5 mL