It was my neuromuscular specialist that ordered it. I was surprised at well it has worked. I am frustrated because when i call the doctor I only get to talk to a resident and not the head doctor who gave me the mestinon. One resident said I might have mg and the nest time I called a different resident said no It is just for the neuropathy.I have Graves disease and had my thyroid irradiated three years ago. I get my thyroid levels checked every four months. My b12 I also get checked 2-3 Times a year. I definitely want to stay on the mestinon since it has been a miracle drug