A nurse is preparing to administer cetirizine 5 mg PO. Available is cetirizine 2.5 mg/5 mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

To administer 5mg of cetirizine with a concentration of 2.5mg/mL, the nurse should indeed administer 10 mL. Here's the corrected calculation: Desired dose: 5 mg Concentration of available cetirizine: 2.5 mg/mL We can find the volume to administer by dividing the desired dose by the concentration Volume to administer = Dose / Concentration = 5 mg / (2.5 mg/mL) = 2 mL However, since each milliliter only contains 2.5mg, we need to administer more than 2mL to reach the desired dose of 5mg. To get to 5mg, we need to administer twice the amount (2 x 2.5mg = 5mg). This translates to: Total volume to administer = 2 mL/dose x 2 doses = 10 mL Therefore, the nurse should administer 10 mL of the cetirizine solution.