Sorry to keep banging on about this stuff.
I have been reading up on THC, one of the two families of drug in cannabis, the other being cannabinol.
I came across some advice on a clinical site which I think is important.
The article said that if someone is taking medication which affects the central nervous system they should seek medical advice before taking any cannabis related products as these have a potential to interfere with them. This would include the Parkinson's medications, anxiolytics and more.
Yes, its fairly obvious, but worth mentioning.
Cheers
Kevin