Barb, Very Interesting..... I had the blood test for thyroid done first because I thought that was what I had (my mother was treated for it for years). Not me though. I stopped taking Eldepryl for that very reason. It made me a "speed freak", up all day/night, sores (speed bumps) on my arms, hallucinations, and major change in personality. I have all along thought there must be a connection between serotonin levels and PD. It is good to hear that a "professional" in the field believes the same. don't forget how to laugh (and do it often) Marling McReynolds [log in to unmask]