First and foremost, my thoughts go out to your father, I certainly hope that he suffers no real harm from this situation.
Having said that, for their to be any real legal recourse here, your father would need to suffer some harm. If this terrible mistake on the part of the staff has no real negative effect, then the law would consider your father to be "whole" and to have no viable cause of action.
If your father does suffer some harm, such as the "Slurred speach, lack of concentration, sleepy, non-caring attitude, slower to walk than usual, clumbzyness, lack of communication", then there may be legal recourse at that time. In that event, you would want to speak to an attorney that focuses on medical malpractice and personal injury cases. As his caregiver and power of attorney, you would have the legal ability to speak with an attorney and initiate the cause of action.
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