I would love to ask this question for my 72yr Father; and hopefully I have all the pertinent info. My Dad has been on Sinemet for 2 years; the 25/100 dose. It seemed to work well with him. His last visit to the neurologist; the doctor informed him that he is getting quite stiff in his right arm (the right arm is the arm that shakes quite a bit); and therefore wanted to change him to 50/200 CR Sinemet. I believe this is a time-release Sinemet? Well, the last 2 days my Dad has been following the new medicine schedule (5am and 4pm); and when he is sitting his right arm is shaking much more than ever. Also, he hasn't slept much at all since changing the dosage. According to the info that came with the drug; it may take several weeks to adjust to this medicine; etc. Any insight to this would be greatly appreciated, as always, Wanda. ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com