I have. In fact, for about 10 years I had to have Gamagard IV infusions every 4 weeks. It's very expensive (I was told). After having the same dose for 10 years, I inquired about possibly having my dose adjusted and was sent to a Immunologist who in turn, stopped all my infusions. I was glad at first but my RA pain has increased since stopping. Steriods will effect your gamma globin for sure but I am not sure about other RA med or treatments. After the first infusion (which is done at a hospital because of not knowing your reaction) I had a slight reacation with dizziness. They gave me a dose of benedryl and I was fine. There after (every 4 weeks), a would be sick about 24-36 hours after the infusion with flu-like symtoms, after that I was fine. They said I would be on this for my life but again, that stopped after seeing an Immunologist (Specialist) who felt it was not necessary after alot of tests. If you Rheumologist is suggesting this treatment I would suggest seeing an Immunologist who knows alot about the treatments. It is a terrible inconvenience to go through if it isn't ABSOLUTELY necessary (not to mention the cost involved, sick feeling, etc.). Good luck though.