I am in this study and have benefited greatly from this drug. The study has been extended for another 12-18 months. I beilieve the reason is that the pool of particaipants was not large enough and the FDA required more info. It will be especially useful for PD patients with low bood pressure that drops when you stand up, etc. I suffered with dizziness, fainting, nausea and vomiting until I began this study. I am doing much better and able to function daily.