Joyce: I just found out about the Parkinson List on America Online and threw out that question about the "on-off" phenomenon because that is the problem my mother is tring to deal with. She is 82 years old, was diagnosed with PD a little over four years ago. She is also in a great deal of arthritic pain and is currently undergoing 2-3 hours a week of physical therapy to maintain some mobility. Up until 6 months ago, she was responding very well to PD medication - only a total of one and one half tablets of Sinemet CR 50/200 per day ( taken at 8 am., l pm and around 6 pm). In the first year she also had about 8 months of treatment with Eldepryl - to slow down the disease we were told - but because her stomach is very sensitive to medications, she discontinued the Eldepryl when the doctor thought it had basically done its job. She is seeing a neurologist who sees Parkinsons patients but he is not what you might call a specialist in PD neurology. About 6 months ago, she began experiencing the "on-off periods and upped the Sinemet to a total of 2 a day, taking l whole pill in the morning and half and half with her other meals. That seemed to help for a while - so she continued going back and forth with the dosage every few weeks or so because 2 tablets a day did result in dyskenesia which she finds very annoying (especially the head movement). The PD continues to progress - more muscle rigidity, some drooling, a little difficulty in swallowing, soft voice, etc. About l month ago, she was having the "on-off" periods almost every day - some lasting for quite a few hours - so her doctor added l/2 tablet of regular Sinemet (25/l00) - which she takes with her first dosage of Sinemet CR. It has helped - especially in the morning - but the increase in Sinemet is producing the dyskenesia. I should add that she takes l0 mg of Prozac before retiring - to help her sleep - in this low dosage, we are told the perception of pain is altered and she can better deal with her arthritic pain. Also, I'm sure the doctor (not her neurologist but her rheumatologist) is addressing the mild depression that seems to accompany her conditions. The worst part of the "on-off" which I'm sure you are familiar with, is the feeling of total exhaustion and shortness of breath. She also complains of a lot of anxiety especially at this time. The doctor does not seem to have many answers for us when we ask about diet, best time to take the Sinemet, the scariness of the "on-off" periods, etc. He tells us and I'm sure he is correct that PD is treated differently in each patient depending on their response. But, we would be more comfortable if we had more information. I do subscribe to the American Parkinson Association's newletter and the National Parkinson Foundation's Report. But I sincerely feel we can get more helpful advice from people like yourself who are living with PD every day. I would appreciate any insight from your experience and trust that this lengthy letter does not take up too much of your time. Thank you and Take Care! Cathy