My dad, who's about 70 and diagnosed with PD about 10 year ago was told by his 2nd neurologist that he has a type of Parkinson's that "does not respond to any of the medications". He suggested sending my dad to Vanderbilt Research Hospital (I think for possible surgery, which thoroughly scared both my parents). After being diagnosed, we always waited for some RX to make a big difference, at least for a while, but none really did; the PD just consistently gets worse. He's been on Sinemet and Azilect and possibly another prescription. The natural Mucuna Pruriens seemed to help some! But last month he's taken a drastic turn for the worse. Do you know anything about THIS TYPE PARKINSON'S and WHY DOESN'T RESPOND TO RX? Thank you all!