Our son is allergic to penicillin so cannot use that for the long-term antibiotic therapy. Is there anyone who has done the long-term therapy using Zithromax? Out PANDAS specialist wants to jump to IVIG but after everything I've read about it including the mixed results with it, makes me very hesitant to make that the next step. Our son not only is allergic to Augmentin and Cephlasporins but he had an allergic reaction the IV steroid therapy and could not even complete that. I am more than a little apprehensive about trying the IVIG without attempting the Zithromax therapy since he can tolerate Zithromax. Any input appreciated.