Hi Deb,
I'm really sorry to hear that your friend has this disease. I hope that it goes very, very slowly for him and he responds well to the treatments available (and that a cure is found soon).
In the USA most doctors have a Merck Manual on their desk. A few years ago, Merck started doing a home edition for patients. This is the home Merck, 2nd edition online:
http://www.merck.com/mmhe/index.html
Here's a search page (I think this will work) on Parkinson's:
http://www.merck.com/mmhe/search.html?qt=Parkinson%27s&qp=%2Bsite%3Awww.merck.com+%2Burl%3A%2Fmmhe+-url%3Aprint%2F+-url%3Aindex%2F+-url%3Aresources%2Fpronunciations+-url%3Amultimedia%2F&charset=utf8&la=en&start=0
here's their link to the main page on Parkinson's Disease:
http://www.merck.com/mmhe/sec06/ch091/ch091d.html?qt=Parkinson&alt=sh
It might also be good to just check the main page for all Mercks and see what else is available, especially if he is good with medical terms:
http://www.merck.com/
I noticed they also had a worldwide manual. Anyway, it is worth exploring.
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The Mayo Clinic is considered one of the best health organizations in this country, I assume they would have something worthwhile, too. Let me check:
http://www.mayoclinic.com/
Yup. They have a large website and there is a lengthy article about Parkinson's Disease.
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Swedish Hospital, in Seattle, is considered the best in this area. Here's their website on Parkinson's Disease:
http://www.swedish.org/16290.cfm
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There are several Parkinson's Disease charitible foundations. Here's one, for example:
http://www.pdf.org/
This one was recommended by my healthcare group (Franciscan Care):
http://www.parkinson.org/site/pp.asp?c=9dJFJLPwB&b=71117