Kahn Study; Investigation Of The Efficacy Of Ziprasidone Versus Olanzapine In The Management Of Recent-Onset Psychosis; A Flexible-Dose, Parallel Group, Double-Blind Study

Inclusion Criteria: * Duration of illness \< 5 years (according to DSM-IV and onset first psychotic episode); CGI severity score \> 4 (moderately ill) * maximum exposure to antipsychotic treatment of =\< 16 weeks. Exclusion Criteria: * Concurrent treatment with antipsychotic agents =\< 12 hours prior to randomization * for depot agents a period of two weeks or one cycle, whichever is the longer, must occur between last administration and randomization * Treatment with antidepressants or mood stabilizers =\< 7 days of randomization * for MAOIs and moclobemide this period must =\< 2 weeks * for fluoxetine =\< 5 weeks