3 000 voksne, hvor virkningen blev sammenlignet med placebo (en virkningsløs behandling) eller haloperidol (et andet antipsykotisk middel).
In schizophrenia, Zyprexa tablets have been studied in about 3,000 adults, in which their effectiveness was compared with that of placebo (a dummy treatment) or haloperidol (another antipsychotic medicine).