The Guillain-Barre syndrome (GBS) is the most common cause of acute pa
ralysis. It requires early institution of therapy to avoid life-threat
ening complications, to speed up recovery and minimize residual handic
ap. Advances in supportive care (treatment of infections, anticoagulat
ion) and the introduction of intensive care (assisted ventilation, tre
atment of autonomic disturbances) have greatly improved the management
of this disease and consequently its prognosis. A better understandin
g of the underlying immune mechanisms prompted pathogenetically orient
ed therapy. Plasma exchange and high dose intravenous immunoglobulin h
ave been demonstrated in large controlled trials to hasten recovery in
GBS. Problems of these studies are discussed and the presumed mode of
action of these therapies is reviewed. Corticosteroids have shown no
benefit. Ongoing trials are listed and future strategies for immunoint
ervention are outlined.