To answer the above questions, I have been taking 4.5mg naltrexone daily, LDN, for the past 46 months. Originally, they said I had MS 5 years ago and gave me meds for tremor which didn't work well. I began taking Sinemet, 3 tabs, about 42 months ago which confirmed PD. Over that time my meds were adjusted so I now take 1.5 Sinemet tabs and 75mcg of Mirapex (still fairly low doses and termor is gone), also several vitamins and magnesium. Do I know if LDN "works", no I don't but so far so good. I can only hope it does but the longer my PD meds stay the same the more hopeful I am. There aren't too many people taking LDN for PD so there is not much feedback on us.
To get LDN you need an Rx from a Doctor (good luck) and then the naltrexone is compounded at 4.5mg with a filler by a pharmacy. There are docs who will Rx over the phone which is what I do. I have the LDN Rx componded by Skips Pharmacy in Fl. You can also look into dextromethorphan which has been talked about on this forum. There is a lot of info on the net also.
Hope this helps. Ashley

http://www.lowdosenaltrexone.org/index.htm
http://skipspharmacy.com/