In one study, deep-brain stimulation for Parkinson’s patients significantly reduced their required dosages of antiparkinsonian medications, consequently decreasing their medication costs by 32% 1 year after surgery, and 39% 2 years after.
Charles, P. David, Bimal P. Padaliya, William J. Newman, Chadler E. Gill, Cassondra D. Covington, John F. Yang, Stephanie A. So, Michael G. Tramontana, Peter E. Kondrad, and Thomas L. Davis. Deep Brain Stimulation of the Subthalamic Nucleus Reduces Antiparkinsonian Medication Costs. Parkinsonism & Related Disorders. 2004; 10(8): 475-9. http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=15542007&dopt=AbstractPlus