What is the best way to retard Parkinson's in a 84 year old man? He is on Parkinson's medication.

Other options. Other then Dopamine agonists, traditional meds for parkinson's disease, MAO inhibitor and comt inhibitors have been beneficial. Physical therapy can help to improve mobility, strength, and agility. Deep brain stimulation has promise - it used for those with advanced cases that do not tolerate medications. It can reduce or eliminate dyskinesia (involuntary movements) and tremor.