After being put on Vytorin to lower my cholesterol, which is a combination of Zetia and simvastatin(Zocor), I started experiencing foot shaking/tremors within a year or two of use if I remember the time frame correctly. I was diagnosed with PD about a year later and have always thought it was not a coincidence. When I mentioned it to my newer primary care physician he basically thought it highly unlikely; maybe due to those early studies of statins decreasing the chances of PD.

Eric