My son received treatments exactly four weeks apart.
He had to stop due to complications. Did I see improvement - yes. Sometimes dramatic. Make sure you get IgA levels checked before going ahead. You want to make sure your child does not have low IgA or complications can happen. Get this check regularly throughout treatment. Will I ever do ivig again - no. The benefits for him do not outweigh the risks. He never came back to himself. It didn't make him recover. IVIG caused more weeks of suffering than happiness for him. The tease was the glimpses of dramatic improvement.
Actually, the most helpful thing for him has been a drug called Namenda. For us, the drug has truly been a miracle and I am excited to see how far it will take him. But again, I highly highly doubt my son's illness is pandas. I believe if your child has traditional no-nonesense pandas, he/she will get better and better and recover with treatment like antibiotics and steroids. Maybe a few ivigs at most. If your child doesn't get better your child has an underlying condition of something else. I am certain my theory will not be a popular one on this board. Perhaps pandas has triggered an underlying condition, who knows. All I am saying is that if you don't see a continual upward trend with ivig, don't waste time. Move onto trying something else. Keep on searching.
All of that being said, one could say that from a research perspective that the long term results of the ivig kicked in at the same time as that the Namenda was started. Anything is possible. One could reasonable state that after 6 months of no ivig his body is now resetting and the good things we see are because of the ivig. A researcher would probably put that in the scenerio of possibilities. However, as his mom, I don't think so. I think that casual relationship is far reached. I think it is the Namenda.
Good luck and don't lose hope. Keep on trying. I hope ivig is your child's cure. It is worth a try.