Hey Kaye! I just spent a while going through many articles on Mestinon and trying to find the reference for the potential discontinuation of the drug to be potentially harmful or fatal. I do not see a study that specifically is looking at this occurrence.
I believe this is because studying this would be too dangerous to test subjects. Animal testing has possibly occurred, but would a human take this risk with MG being so individualized? I think the source of information is doctors who report adverse reactions when their patients discontinue Mestinon without tapering. Whether with doctors' orders but most likely did it independently due to side effects. It probably is a warning to all doctors treating this in the medical world.
I think you would most likely not die because information on the drug indicates that it should be discontinued if rare, possibly fatal, side effects occur. But I think it is highly likely it could worsen symptoms by throwing the body out of whack - Jodi, Team Member