A client receives a prescription for penicillin 1.2 million units IM. The available vial is labeled, "600,000 units/2 mL." How many mL should the nurse administer? (Enter numeric value only.)

Calculations: Desired dose: 1.2 million units Available dose: 600,000 units/2 mL To find the volume to administer, we can use the following formula: Volume to administer = (Desired dose / Available dose) * Volume per dose Volume to administer = (1,200,000 units / 600,000 units/mL) * 2 mL = 4 mL Therefore, the nurse should administer 4 mL of the penicillin solution.