Autoimmune disease is our body fighting our self.Without Ig products I needed other meds online. My doctors decided on Rituxan/Rituximab.During the 2.5 years of IVIg/SCIg I didn't catch colds and flus.However, since being off IVIg, I catch any and every virus that's circulating. That was a tremendous benefit. The difference is remarkable.Our bodies cannot rally a defense on immunosuppressing drugs. This is so that our bodies are kept in a state that lessens the attack we are mounting on ourselves.Rituxan keeps my B cells from maturing. Have you taken an infusing med or been on a biologic? Leave me a comment and tell me how that's gone.