My pandas ds developed severe neutropenia from extended use of full strength augmentin plus ivig (which temporarily lowers neutrophil counts). Our immunologist plus two hematologists were involved and all agreed that extended use of some antibiotics can cause this. We cut his augmentin dose in half and his neutrophil count bounced back. He continues to get ivig, but we check his neutrophil count before hand to make sure it is high enough to go ahead, knowing that the ivig will push down his neutrophils.