Thanks so much for your very helpful replies.

Abby - I'm glad to hear that 30mg wouldn't do that much damage even if I didn't have MG... I think I might split the tablet the first time to see what happens - feeling very nervous about it. Then again, I have read that Mestinon is sometimes prescribed for constipation - presumably for people without MG, and they don't pop their clogs after taking it! I wonder what sort of dose they're on...

Anyhoo, are there any nasty surprises I should expect from the Mestinon other than an upset tummy?

Thanks again! x