Dear Dr. Roach: I'm a 65-year-old and otherwise healthy male. After spending the past five years believing that my trembling hands were the result of essential tremor, a second DaT (dopamine transporter) scan (the first one was misread, I guess) and a neurologist at a teaching institution confirmed that I am and have been suffering from Parkinson's. The medicines that I have been prescribed are carbidopa/levodopa and recently amantadine.

While the meds are working well for now, my question for you is: What will the long-term issues with my liver and kidneys be after taking these medicines for the rest of my life -- assuming, of course, that the dosage remains the status quo?Also, what, if any, progress has been made with the effective treatment of this disease and the accompanying diagno

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