Hi Jujuan,
Besides what Erin just wrote, I was advised to drink at least 1.5 liter of water per day during the IVIg's, it worked well for me.
About the rate of injection, it should be slow, about 3 hrs per bottle of 200 cc to start. If you're OK, (i.e. without headache), that rate could be increased to 1.5 hr per bottle, but you may only make suggestions…
Maurice.