A client receives a prescription for a single dose of midazolam 2 mg IV to be administer before a scheduled procedure. The vial is label, "4 mg/2 mL." How many mL should the nurse administer? (Enter numerical value only.)

Here's the answer and explanation again: We know: Prescribed dose: 2 mg midazolam (given) Vial concentration: 4 mg/mL (label) We need to find the volume (mL) in the vial that contains the prescribed dose (2 mg) considering the concentration (4 mg/mL). Calculation: Volume to administer (mL) = Dose (mg) / (Concentration (mg/mL) / 2) We divide the concentration by 2 because we need the volume that delivers 2 mg (half the concentration). Volume to administer (mL) = 2 mg / (4 mg/mL / 2) Volume to administer (mL) = 2 mg / 2 mg/mL Volume to administer (mL) = 1 mL Therefore, the nurse should administer 1 mL of midazolam from the vial to deliver the prescribed dose of 2 mg.