How long does it take before the full benefit of DBS is apparent?

For reasons that are not fully understood, the improvement in parkinsonisan symptoms my take a few hours or days to reach its maximal level following a programming change. Some symptoms may respond more quickly than others. In addition, to realize the full benefit of DBS, medication changes and multiple programming sessions may be needed. Thus it is usually a few months after surgery before the final degree of benefit is actually realized.