Great questions.
I'm not entirely savvy on IVIG usage medically, but I can give a non-technical little overview. With the help of google and some medical documents of course.
So first, why we choose to use IVIG. In my DMD history I've used Rebif, Tysabri, Tecfidera, and Rituxan. I have also used Plasmapheresis as a treatment. Rituxan was my latest DMD and I really did give it a good try. My body has a hard time with all drugs but rituxan, damn, it was brutal. Quality of life was not worth it. And, we couldnt confirm if it was or was not working. It was an easy decision for me to be like "no thank you, no more".
I went with no DMD medicine or treatments for 10 months and though I wouldve loved to go further, my doctors advised me to consider a treatment. I agreed.
I received IVIG at my MS clinic's infusion center at a hospital in downtown Pittsburgh. The nurses were fabulous and got a IV line in one try. I love nurses!