The healthcare provider prescribes interferon beta-1b 0.125 mg every other day for a client with multiple sclerosis. The nurse reconstitutes the single-use vial of powder labeled 0.3 mg with 2 mL. of sterile water. How many mL should the nurse administer to the client? (Enter the numerical value only. If rounding is required, round to the nearest tenth)

Given: Ordered dose of interferon beta-1b: 0.125 mg Vial strength: 0.3 mg Reconstitution volume: 1.2 mL Step 1: Determine the concentration of the reconstituted solution: Concentration (mg/mL) = Total amount of medication (mg) / Volume of solution (mL) Concentration (mg/mL) = 0.3 mg / 1.2 mL Concentration (mg/mL) = 0.25 mg/mL Step 2: Calculate the volume to be administered: Volume (mL) = Desired dose (mg) / Concentration (mg/mL) Volume (mL) = 0.125 mg / 0.25 mg/mL Volume (mL) = 0.5 mL