Another one from England here. I have been searching the internet for Myotonia Congenita related information but this is the first time I've come across this board!
I've bookmarked it and I will most definitely be back!
By the way, I used to use mexitil but they stopped making it last year and I'm currently trialling different alternatives, currently on Clonazepam with mixed results!
You are probably right. I had trouble getting my prescriptions filled and found both my neurologist and pharmacist incabpable of providing a reason why. I contacted the company, Boehringer Ingelheim Limited, and they confirmed that Mexitiline was discontinued in June 2008.