Immunoglobulins, used at first empirically in the treatment of thrombo
cytopenic purpura, occupy a prominent place not only in the treatment
of antibody deficiencies, but also in that of antoimmune diseases. The
ir indications in neurology are ever extending; they include myastheni
a, chronic inflammatory polyneuropathies with or without monoclonal ga
mmopathy, polymyositis, dermatomyositis and, more recently, disseminat
ed sclerosis and Guillain-Barre syndrome. Even the therapeutic priorit
y of plasmapheresis in this syndrome is disputed by some authors. Immu
noglobulins are costly, but they are well tolerated and easy to use. T
heir effectiveness must be confirmed by controlled, double-blind trial
s. In neurology such trials are still rare, but those recently publish
ed are devoid of methodological errors. Once the effectiveness of immu
noglobulins is confirmed, their dosage must be established, and attemp
ts should be made at a better understanding of their mechanisms of act
ion.