The nurse is preparing to administer an ampicillin suspension labeled, "Ampicillin 250 mg/5 mL," to a child with impetigo. The prescription is for 500 mg four times a day. How many mL should the child receive per day? (Enter numeric value only.)

Determine the amount to administer per dose: Desired dose = 500 mg Available concentration = 250 mg / 5 mL Volume per dose (mL) = Desired dose (mg) / Concentration (mg/mL) = 500 mg / (250 mg / 5 mL) = 500 mg / 50 mg/mL = 10 mL Calculate the total daily volume: Number of doses per day = 4 Total daily volume (mL) = Volume per dose (mL) x Number of doses per day = 10 mL/dose x 4 doses/day = 40 mL