Anyone who does not have high blood pressure who is thinking of DIY'ing isradipine needs to be cautious.

As Tupelo3 says isradipine is used for hypertension. So, it can be expected to lower blood pressure. This could push someone with already lowish blood pressure, common with PD, dangerously low, especially when you include our slowness to change blood pressure on standing (postural hypotension), again common with PD; resulting in fainting and falling. See your GP.

See:
http://www.parkinsons.org.uk/sites/d...odpressure.pdf

John