System and methods for introducing one or more stimulating drugs and/or applying electrical stimulation to the cortex of the brain to treat movement disorders uses at least one implantable system control unit (SCU), specifically an implantable signal/pulse generator (IPG) or microstimulator with two or more electrodes in the case of electrical stimulation, and an implantable pump with one or more infusion outlets in the case of drug infusion. In certain embodiments, a single SCU provides both electrical stimulation and one or more stimulating drugs. In some embodiments, one or more sensed conditions are used to adjust stimulation parameters.