Actually, it can be prescribed right now off-label. The FDA only controls drug approval, not drug prescribing. Doctors are free to prescribe any drug for any reason they believe is medically appropriate (in the USA, not sure about other countries). Of course, it does open the doctor to more liability risk. Also, insurance companies are unlikely to cover the cost of the prescription.

If you don't want to wait for the end of the phase 2 trials, or can't find a doctor to prescribe off label, or can't afford this expensive drug, yet still want to take it, then consider volunteering for the multi- center study next year. If you qualify, you can get the drug for free and properly monitored (assuming you don't get the placebo.....). You'll also be helping the whole PD community by moving the science forward.