A nurse is preparing to administer labetalol 40 mg IV to a client. Available is labetalol 5 mg/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.)

Calculation: Identify the prescribed dose and the available concentration. Prescribed dose = 40 mg Available concentration = 5 mg per 1 mL Calculate the volume in milliliters (mL) to administer. Volume (mL) = (Prescribed dose (mg) / Available concentration (mg/mL)) = (40 mg / 5 mg/mL) = 8 mL.