My husband has been diagnosed and treated as bipolar for most of his adult life (age 19 to present ). A year or so ago, he had toxic encephalopathy because he was retaining urine and that meant he was re-absorbing his lithium. During this time, which took quite a while to recover from, they did a neurological workup - CT, MRI, lumbar puncture and EEG - and afterwards, when I talked to the doctor and told her about some of the behaviors I had noticed (hallucinations and acting out his dreams) she said she felt he had Lewy Body Dementia. No formal diagnosis was ever made. He's in a psych unit right now - he seems hypermanic, but his behaviors are not what I have come to expect, only time to time. He has not been "mean", which he is very good at normally when he is hypermanic. He's generally kind to his aides and nurses and accepting of treatment. Contrariwise, he is very paranoid, which he has not generally been in the past and he has convinced himself that he has radiation poisoning. I think the hallucinations have continued, but he won't talk about them. If you have dealt with the bipolar/dementia dichotomy, what changes have you seen in your loved one? Has it affected medications? He's on lithum and seroquel/quetiapine. Any feedback appreciated.