Magnesium Sulfate Infusion Calculation

A patient has been prescribed magnesium sulfate for the treatment of eclampsia. The order is for a continuous infusion at a rate of 2 grams per hour. If the available magnesium sulfate solution is 50% (or 500 mg/mL), calculate the volume (in mL) that needs to be administered per hour. Fill in the blank with your answer:

Volume to be infused per hour: ____ mL