I am a nurse shift supervisor at a 122 bed free-standing psychiatric facility. Today, a pt dc'd about 11am from our CD unit and was waiting in our lobby for a ride. He remembered he had brought in home med of Ambien on admission and asked for it to be returned to him. I got it from pharmacy, checked that MD had given him a Rx for it, and gave it back to him around 12pm (his ride still had not arrived). About 1pm, his wife arrived to pick him up and reported that he told her he had taken 3 of the Ambien 10mg tabs while waiting for her to arrive. I called his SW who came to the lobby and he and I escorted the pt and his wife to a conference room where we could talk. She did not want to take him home, as he appeared drowsy and confused. I reported the sitution to our DON who told me to call 911 (as we were not sure how many pills he had actually taken). I called 911, reported the pt's hx and current situation and, when the 4 EMTs arrived gave them report once again and gave them copies of his dc meds, h&p, face sheet. The SW was in the room with him, along with the 4 EMTs and I stepped away from the situation, as I had duties for current inpatients I needed to attend to (and I only had 30 minutes til my shift ended). When my relief arrived, I told her the situation, did an incident report, and called director of risk management to inform her of the situation as well. The EMTs were actually still on our premises, so I suggested that my relief check on the status of the patient who was still in lobby being assessed. When I got home, I recieved a text from my DON stating that SW had reported me to CEO for not staying with the patient til he was taken away by ambulance. Should I have stayed? Technically, he was no longer our patient and my current inpatients were my priority