Although this is not an area of expertise for me, I came across a couple of publications that may be helpful in answering your question. Human intravenous immunoglobulins (IVIG) appears as a treatment for many neurological diseases.
Regards,
Christopher
Dolezal, O. (2014). Intravenous immunoglobulin treatment in chronic neurological diseases: do we have maintenance dose right?. Autoimmune diseases, 2014.
Lagae, L., Arzimanoglou, A., & Zuberi, S. M. (2013). European Journal of Paediatric Neurology.