Final answer:
Sodium nitroprusside (Nipride) is the drug that will most likely be used to control the patient's blood pressure initially.
Step-by-step explanation:
The drug that will most likely be used to control the patient's blood pressure initially is Sodium nitroprusside (Nipride). Sodium nitroprusside is an intravenous medication commonly used in the intensive care unit for the treatment of hypertensive emergencies. It acts as a potent vasodilator, meaning it relaxes the walls of blood vessels, leading to a decrease in blood pressure. Sodium nitroprusside works quickly to lower blood pressure and is closely monitored to ensure appropriate dosing.