As Celeste said - it works differently for all of us. For me, the first time I had IVIG was at the time of my first crisis and it was done in the hospital. I woke up the 3rd morning and thought I had died and gone to heaven! I felt better than I had in months and was actually able to work across the room without tripping and falling! It was wonderful. My results are not as dramatic 9 years in, but it definitely helps me continue to live my life the best I can.

Good luck to your father - hope it works well for him.