IVIG is a blood product, not a drug, exactly. It contains antibodies from up to 10,000 people. Infusion takes anywhere from 2 and a half hours to 8 hours depending on your tolerance. Some people have reactions or feel funky for a few days. It is very expensive. Check your insurance. It also contains a lot of protein, which can be hard on kidneys and you must have your kidney function monitored.

I can't comment on plasmapheresis. Haven't had that.