Hi,
As well as asking here, I'd probably ask back on the
Myasthenia Gravis Forum. The members there would have up to date information about medicaitons that you can't use I'm sure.
Here is one post I found from the Sticky thread - Useful Sites for Myasthenia Gravis.
http://neurotalk.psychcentral.com/post1145467-7.html
Medications