Thank you for the hydration advice. I forgot my "watering can" on my last Ivig and they only had the 4oz bottles. I was there for almost 8 hours so I had quite the pile of empties. I do hydrate so much more before. I found out thos past infusion that it should take 4 1/2 hours not less than 2 hours. Hmm no reason now to wonder why I had horrendously wicked headaches for weeks after.