Quintuple bypass symptoms and conditions

My father was in for a quintuple bypass and had a stroke on the table. After surgery they put him on Levaquin, unbeknownest to me. He is now in a rehab facility and had I not walked in one morning and saw the IV drip, I would not have known. He has been having wild hallucinations and confusions so I asked them about it and they discontinued the drug right then. He was on this drug for 22 days, and 6 days later there has been very little change in him. I am very concerned about this, he was always very independent (only 73 years old) he did everything for himself and to see him like this breaks my heart. I hope it will eventually will get out of his system, but from what I have read I am doubtful. Make sure no one you know and love is put on this crap, I sure wish I would have known 22 days sooner.