I was put on isradipine when I was dxd with PD. Still taking it now. It has "changed" my PD from mostly rigid to mostly tremors. My MDS says the NW drug is a more specific calcium channel blocker and can be taken in higher doses without affecting blood pressure.

Isradipine used to be available as a controlled release formulation but was taken off the market a while ago. The standard release formulation is available as a generic.