Thank you very much for this. This is every helpful , especially for those of us with MG with negative antibody. It took forever for diagnosis until I started looking like the cartoon character "Droopy" then I had to clue my Neuro in on negative antibody MG and my textbook symptoms. I just started Mestinon a few days ago and trying to deal with Gi upset. Research like this can make a great difference in all our lives.