I've had PD for 18 years (I'm 52 now). Had DBS surgery 4 1/2 years ago. The physical symptom that still gives me the most trouble -- not helped by either the meds or the surgery -- is gait freezing, and subsequent falling. My MD just prescribed a low dosage of Ritalin for this, and I haven't filled It yet. I'm wondering if anyone else has had experience with Ritalin for gait freezing, or has heard about this?