My father is on multiple medications and we have been in and out of emergency rooms and different Drs in the last few months. We are just realizing he may have taken things that are not suppose to be taken together. We think he took 1or2 oxycodon 5 mg at 12 Pm. He was given 1 tsp of cheratusssin ac syrup and half a Xanax 1 mg at 1 pm. He has been sleeping soundly. We can wake him up. Is this something to be concerned about? He has not slept much in days and is exhausted.