I got IVIG for four days while in the ICU. I had no adverse reaction. In fact, I began to show steady improvement as soon as it was started. However, about three weeks later the effects had worn off and I needed it again. This time I got it outpatient at the infusion center. The first day it took 12 hours! They did a real slow drip to make sure that I had no adverse reaction. The next three days it took about 6 hours each. But I feel soooo much better now. I hope the benefits hold this time. I'm curious if any of you have trouble getting your insurance company to pay for IVIG outpatient. I'm told it costs $20,000. per dose - 4 days worth.