Hi,
I only had IVIG once. When I started treatment I had to receive IVIG to start my prednisone dose and mestinon. I was in the hospital for two days. But I think the only reason for this is because the bottom part of my lungs were not expanding. Anyway, I ended up getting viral meningitis. I have a friend with a different condition and the main treatment he receives is IVIG. There are different kinds of IVIG, so if your mother has a bad side effect maybe there is a different kind that will work for her. I hope everything works out for her.