Hi, Francisco. Welcome to the forum.

Yes, you can get more than one five-day course of IVIG. Many people here do that. I hope that your neurologist will understand that the one-day infusion isn't enough for you.

I hope your doctors will also offer you other treatments besides IVIG. Most people here take Mestinon, and most of us also take one of the drugs that suppress the immune system (Prednison, Imuran, Cellcept or others).

Abby