The patient has a primary diagnosis of schizophrenia

The patient has been hospitalized with acute or relapsing schizophrenia within 3 weeks of screening

The patient has had a duration of illness of at least one year.

The patient has a BPRS score of at least 42 at baseline and a score of at least 4 in two or more items of the positive symptom subcluster on the PANSS

The patient is able to remain off antipsychotic medication for a 4 day washout period

A Comparison of Study Drug With Placebo and Haloperidol in Patients With Schizophrenia

What this study is about