My MG blood tests came back negative. I take 60mg mestinon every 2 1/2 to 3 hours. (7 pills a day). It works great for me. Last year I was in the hospital out of state and they took it away from me saying I didn't have mg, but I started it back up as soon as I was released. Different doctors seem to have different opinions. Some say if Mestinon helps then you have mg. Others say you have to have the antibodies. As long as they keep giving me my mestinon I guess it doesn't matter what they call it. I usually say I have a myasthenia- like disorder