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Paula,
As with IVIG, it is best if you hydrate super well, half your body weight in oz, 24 hours prior.
I have had no side effects.
how long was the actual needle in the arm and out infusion?
it should run about an hour, at least mine does and they use 2 vials of vyvgart for my weight. That would impact the time.
did you get connected with a Vyvgart nurse?
if jot, you might want to go to their website and connect direct with someone and explain your side effects. Or your doctor of course, however, also vyvgart as they will have the most experience to guide you.