I don't know anything about Zonogran.

The cannabis part sounds good though. If it were to help, I see no logic in denying relief from suffering when the source of the relief is both natural and available. It should be legalized, regulated, taxed and demystified. I haven't tried it since I've had PD. I've been wondering though. Even if it just let me forget about my problems for a while, it might be worth it.