Hello M.T.I.

I too have Becker's MC.

I find the muscle weakness very noticable, my arms or legs can give way at the joints without any warning. I have to be carefull when carrying heavy things or reaching for anything above head height.

Even when 'warmed up' my muscles can suddenly give way, but for the most part they do behave normally. I take flecainide and it helps with the siffness but not with the weakness.

Type of Myotonia: Becker's

Country: England