- Primary diagnosis of schizophrenia or schizoaffective disorder, using DSM-IV criteria.
- Currently receiving either haloperidol, olanzapine or risperidone within -/+ 25% of
the recommended daily dose (as delineated by the medication's package insert
- Resistance to conventional antipsychotic drugs
- With antipsychotic agents other than olanzapine, risperidone or haloperidol at start
of treatment regimen within 12 hours prior to first dose of study drug