Final answer:
In the case of severe hypoglycemia, glucagon would be administered intravenously to increase blood glucose levels.
Step-by-step explanation:
If a patient is brought to the emergency department with severe hypoglycemia, the nurse would prepare to administer glucagon (Glycogen) intravenously. This is because glucagon is a hormone that stimulates the liver to convert glycogen into glucose and release it into the bloodstream, thereby increasing blood glucose levels. Insulin, on the other hand, decreases blood glucose levels and would not be appropriate for treating hypoglycemia. Drugs like glyburide and metformin are also not suitable as they are used to lower blood glucose levels in diabetic patients.