I think the bottom line here is that grapefruit in any form can interfere with some medications, and it’s probably nothing to do with the disease itself. Here’s a good FDA article that explains:
Looking at the list of medications that could interact, I’m guessing that several of those could be used in the case of CIDP. I guess the neuro, wanting to keep it simple, just said “no grapefruit”.
Your personal authority is, of course, your pharmacist. If you aren’t already on a first-name basis with your pharmacist, I highly recommend it! Mine has both saved my hide and given me some great advice over the years!
Seenie from Modsupport