I think this post illustrates the problems that the medical world have in treating MG. In my case I was diagnosed 6 years ago and initially prescribed Pyridostigmine ( Mestinon) and I was free to dose myself up to 6 pills per day and I used them, I continue to take them but a rate of 5 a day . My symptoms were double vision and my head dropping on to my chest after a very small amount of exercise of any kind with what was in effect a muscle lock. After resting for approx 20 mins this eased.
The Mestinon fixed my eyes so then we moved on to Prednisolone with a steadily increasing dose at one point 70mg every other day. This fixed my head and neck muscle locking issues. currently I take 20mg per day on average. After a while in association with a reducing prednisolone dose I was prescribed Azathioprine, currently taking 150mg daily. As far as I know I've had none of the possible side effects other than reduction of bone density and minor blood abnormalities . I would add I am physically much weaker than I was but perhaps in an odd way I can lift straight up by my side, one armed in a straight vertical lift 18KG or so, but If I try to lift a fraction of that on a tray with both arms I simply can't do it. I would add I am in the UK.