Final answer:
Loosen the patient's restrictive clothing.
Step-by-step explanation:
The most appropriate nursing action when a patient with a documented history of seizure disorder experiences a generalized seizure is to loosen the patient's restrictive clothing.
During a generalized seizure, it is important to ensure the patient's safety and prevent injury. Restraining the patient to prevent pressure injury or opening the patient's jaw to insert an oral airway may cause harm and should be avoided.
Placing the patient in a high Fowler's position may be ideal after the seizure has ended to promote airway clearance and recovery.