The healthcare provider prescribes magnesium sulfate 300 mg/hour IV. The IV bag is contains magnesium sulfate 4 grams in dextrose 5% in water (DW) 500 mL. How many mL/hour should the nurse set the infusion pump? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

Step by step calculation: Determine the concentration of magnesium sulfate in the IV bag: The IV bag contains 4 grams (4000 mg) of magnesium sulfate in 500 mL. Concentration = 4000 mg / 500 mL = 8 mg/mL Determine the prescribed infusion rate: The prescription is for 300 mg/hour. Calculate the infusion rate in mL/hour: Infusion rate (mL/hour) = Prescribed dose (mg/hour) / Concentration (mg/mL) Infusion rate (mL/hour) = 300 mg/hour / 8 mg/mL Infusion rate (mL/hour) = 37.5 mL/hour