What is the appropriate nursing action if a patient receiving magnesium sulfate has decreased deep tendon reflexes?

When a patient receiving magnesium sulfate exhibits decreased deep tendon reflexes, it is indicative of potential magnesium toxicity. In such cases, the appropriate nursing action is to discontinue the intravenous infusion of magnesium sulfate. This is essential to prevent the situation from worsening, as further administration could lead to more severe complications, including respiratory depression, cardiac issues, or even loss of consciousness.

Monitoring vital signs closely is important, but it does not address the critical issue of increasing magnesium levels and the patient’s response to the medication. Increasing the infusion or administering an additional dose of magnesium sulfate would not be safe, as the patient's reflexes indicate that they are already experiencing a level of magnesium that may be excessive. Therefore, stopping the infusion is the priority to ensure patient safety and prevent further complications.