About Mestinon,
I love Mestinon even with all the side effects, which I have slowly learned to either live with or minimize. Without Mestinon I am pretty much bedridden...
I can't tolerate Mestinon on an empty stomache, because this seems to quickly bring on the side effects (drooling, diarrhea, twitching, nervousness, cramping, etc). But if I eat a little first and then drink a BIG glass of water afterwards, I tolerate it pretty well. I do have to drink extra water all day as well to keep the side effects tolerable.
I don't have an allergic reaction to Mestinon which is serious and needs immediate attention as Annie said earlier. I worry about becoming allergic to it, since I seem to easily get allergic to medicines, but ok so far.