Once prescribed how much can I buy, how often, and are there different ones for different issues?

85 grams every 2 weeks max. There are different strains for different issues like nausea or pain.

Jacob, DE doesn’t sell edibles.

I max out my 85 grams every 2 weeks but its not traditional "pot" as we see it. I don't smoke any flower and I use oils and edibles. And when you go thru the required orientation the dispensary and the Dr should answer all this. If you're asking a blog instead of your Dr something is wrong.