IVIG (Gamunex-C) Treatment Study for POTS Subjects

"If you participate in this study there will be 18 scheduled treatment infusions during the 30 week study period. All the study visits and treatment visits will be outpatient visits.~Once you qualify to participate in the study and begin treatment, there will be two 12 week treatment periods separated by a 6 week washout period. The infusion visits will take approximately 3-4 hours each."

This will be the matching placebo used in the study.