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 is available in a 10 mg/mL ampule, and the hydroxyzine is available in a 50 mg/mL vial. How many total mL should the nurse administer? (Enter the numeric value only. If rounding is required, round to the nearest tenth.)

Here's how to calculate the total volume the nurse should administer for the combined medication: 1. Calculate the volume of hydromorphone: Dose: 4 mg Concentration: 10 mg/mL (from ampule label) Volume (mL) for hydromorphone = Dose (mg) / Concentration (mg/mL) Volume (mL) for hydromorphone = 4 mg / 10 mg/mL Volume (mL) for hydromorphone = 0.4 mL 2. Calculate the volume of hydroxyzine: Dose: 25 mg Concentration: 50 mg/mL (from vial label) Volume (mL) for hydroxyzine = Dose (mg) / Concentration (mg/mL) Volume (mL) for hydroxyzine = 25 mg / 50 mg/mL Volume (mL) for hydroxyzine = 0.5 mL 3. Add the volumes for each medication to find the total volume: Total volume = Volume (mL) for hydromorphone + Volume (mL) for hydroxyzine Total volume = 0.4 mL + 0.5 mL Total volume = 0.9 mL (round to nearest tenth as requested) Therefore, the nurse should administer a total of 0.9 mL.