IVIG: Gammaked vs Gamunex-c

Hello, I am being treated for CIDP. I started out on Gammaked for a while until I was switched to Gamunex-c last year when supposedly Gammaked was no longer obtainable by the infusion center.

I don’t seem to be doing as well on the latter in spite of higher and higher doses with less time between doses, so I have a couple of questions.

1. They both appear to be manufactured by Grifols (or at least were at one time but gamunex is now listed via Kedrion although it is not clear to me the companies relationship if any).

Can someone explain the differences in the two products if any?

2. Has one been demonstrated to perhaps be more effective than the other in CIDP management? If not, why select one over the other?

3. Is there still difficulty in obtaining Gammaked (if there ever was)? Was going to talk to Neuro about experimenting to see if I respond better if we changed brands, going back to the original Gammaked I was on. Although if both the same, that would not be worthwhile.

Thanks