Although most patients still need to take medication after undergoing deep brain stimulation (DBS), many patients experience considerable reduction of their PD symptoms and are able to greatly reduce their medications. The amount of reduction varies from patient to patient but can be considerably reduced in most patients. The reduction in dose of medication leads to a significant improvement in side effects, such as dyskinesias (involuntary movements caused by long-term use of levodopa). In some cases, the stimulation itself can suppress dyskinesias without a reduction in medication.
This answer is based on source information from the National Institute of Neurological Disorders and Stroke.
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