Karly Simpson is one of the nurses working at Regina General Hospital in the city's downtown.
She says there haven't been significant changes since a security incident involving her colleague in December.
Police say a man followed a nurse to her car, hit her when she got in and stole her purse.
On Wednesday night police say there was another incident when a 17-year-old pointed a firearm at another man outside the hospital.
The suspect ran from the scene but police were able to track him down, finding him with an unloaded sawed-off shotgun.
The teen now faces eight charges, including possession of a dangerous weapon and assault with a weapon.
NDP deputy leader Trent Wotherspoon said there needs to be urgent action to improve security.
He said not enough is being done to ensure the safety of patients and hospital staff.