The nurse is preparing a client's dose of an IM analgesic in a single syringe. The prescription is hydromorphone 4 mg and hydroxyzine 25 mg. The hydromorphone ampule is labeled 10 mg/mL, and the hydroxyzine is labeled 50 mg/mL. How many total mL should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)

Calculation: Calculate the volume of hydromorphone to administer. Volume of hydromorphone (mL) = Desired dose (mg) / Available concentration (mg/mL) = 4 mg / 10 mg/mL = 0.4 mL. Calculate the volume of hydroxyzine to administer. Volume of hydroxyzine (mL) = Desired dose (mg) / Available concentration (mg/mL) = 25 mg / 50 mg/mL = 0.5 mL. Calculate the total volume to administer. Total volume (mL) = Volume of hydromorphone (mL) + Volume of hydroxyzine (mL) = 0.4 mL + 0.5 mL = 0.9 mL.