Thank you both. I am actually in Canada on provincial coverage and IVIG isn't off label here for mg for severe exacerbations or crises, but it is not recommended for maintenance treatment. I called the clinic where I am to go and they said I can take all my regular meds, be there early for blood work ( I think something about cross typing?) and they think it will take about 2 1/2 hours.

I'm very glad to know they monitor you closely. I don't alway have luck with new meds/treatments, I tend to have a lot of side effects.