Dementia and hallucinations

Hi. Thank you for taking the question. My uncle (70) has had Parkinson's for quite a while now. Recently his condition has got worse as he started having problems with staying asleep at night (would doze off during the day quite often). He has hallucinations and sometimes he doesn't seem to know what he's talking about. He is often be mean to my aunt, acusses her of different things, etc. I'm really concerned since she's a very sick person herself and I don't know how long she will be able to take it.
A week ago I found an article on the net that a drug -Clozepine (sp?) can be helpful in treating patients with PD who have hallucinations, etc. What's your opinion about this drug? Also - is there anything that can be done with the sleep problem?
Kate

[CCF-Neuro-M.D.-CS]

In the later stages of Parkinson's disease a patient may have cognitive side effects, or may develop a seperate dementia like illness. What I would recommend is that he be re-evalauted by his neurologist. The hallucinations could be due to a medication he is tatking, disease progression, infection, or a new disease process. Medications such as Clozapine and the other newer anti-psychotic agents can be used in Parkinson's disease. The older agents can make the Parkinson's symptoms more severe. Also, sedating agents may be prescribed for the insomnia. Good luck.