Levaquin and stomach pains

My Dad has had colon surgery. Levaquin was prescribed. My Dad is 84. He was doing very well for several days, then went off the deep-end. He had hallucinations and aggressive behavior to name a few of many,many side effects. He thought they were trying to kill him. Unhooked all the intravenous and oxygen tubes and left. They caught him at the stairs. Had to sedate him and tie him down. My Dad did not know me nor my brother.

He has been off the intravenous drug for several days. While better, he is still working off the effects.

He has had many of the listed side effects, however, with the colon surgery how much is part surgery and part drug as far as nausea, stomach pains, bowel issues, vomiting, is a guess. However, he went from doing very well to a mess.