AYAME -- take a deep breath, and tell your friend to do the same.
First -- did anyone suffer NEGATIVE outcomes from the expired doses?
Second -- what is known about WHO STOCKED THE FRIG? and were there lots of vials in there, some still in-date, some out-of-date?
Third -- is she the ONLY one to whom this action can be traced?
I ask you this because, your friend clearly had the responsibility to fully check the lable on ANY drug she might administer, but she is not the first nurse in history to make this mistake!
Also, if the refrigerator was stocked by a pharmacist (or even the nurse manager, charge nurse, etc.) there may be SHARED liability here.
And, who CHECKS the refrigerator? Is there a policy that indicates it is CLEANED each week (by whom, according to what criteria, etc.)? If that is the case and someone else left out-of-date drug in the refrigerator, there may be some shared responsibility there as well.
Please, don't let your friend panic. She might want to talk to a lawyer (independent of what the facility lawyer may do or say) just to learn her rights and her dangers.
This is not insurmountable, especially if none of the patients was injured. So, again, take a deep breath!
--p