MY WIFE HAS HAD RECENTLY HAD A LONG STAY IN

MY WIFE HAS HAD RECENTLY HAD A LONG STAY IN THE HOSPITAL AND REHAB. SHE SUFFERS FROM CHRONIC PAIN AND WHEN SHE CAME HOME SHE WAS PLACED ON OXYCODONE AND HAS SOME MEMORY LOSS. SHE WAS ON A VENTILATOR IN THE HOSPITAL FOR FOUR DAYS CAUSING SOME OF THE MEMORY LOSS. QUESTION: IS IT POSSIBLE THAT THE OXYCODONE IS CAUSING THE MEMORY LOSS AND CAN SHE STOP THE OXYCODONE? IF SO HOW LONG DOES IT TAKE TO CLEAR THE SYSTEM.