It may be possible to rearrange certain cells to help with the disease. It's a complicated question that is difficult to explain. The human genome will change all of medicine. One problem may be that substances in the brain may break down the dopamine, in which case other approaches will be researched. There are a number of other conditions that can mimic Parkinson's.
Some drugs can mimic the disease.
In this case, the drug is removed. For example, Johnny Cash does not have Parkinson's. One syndrome called Shy-Drager syndrome can mimic the disorder. Lewy body disease can start like Parkinson's but has slightly different symptoms. Mr. Cash only has symptoms like Parkinson's.