People just go around liking posts I have noticed, don't worry about it too much.
https://exitinternational.net/media/ch12FAQ.pdf
This is the best answer I have ever seen on the issue.
In short, there will be a long comatose period prior to death, rather than the N not working at all. It makes it more likely that there will be medical intervention.
The briefing says to cease several days before, which shouldn't be too hard. Obviously, however, I would err on the side of longer in case you have any liver damage from the medication, which needs some repair time.