The case of a patient with reappearing stupor, accompanied by auditory hall
ucinations and persecutory ideas during the periods and not with alternatin
g excitement, is reported. After 24 years of neuroleptics medication with l
ittle effect, the lithium carbonate regimen was started, which showed a rem
arkable prophylactic effect. The implications of lithium carbonate treatmen
t for recurrent psychosis are discussed.