My husband is being treated by a neurologist. he has had many blood tests, MRI s, CT Scans, EMG, Nerve conduction studies and we still have no diagnosis. He has almost all of the symptoms of MG but the lab work doesn t show the antibodies that prove it. Last week the Dr started him on mestinon. I guess my question is, since my husband also drinks, is this safe? what is the probability that this is ALS instead of Myasthenia Gravis? He also has really severe Dupytrens contracture .