Inpatient hospitalization within past 3 months.

Residence at the current address \< 3 months due to any instability in the disease.

Presence of depressive symptoms.

Past history of clinically significant violent behavior.

Substance dependence or abuse.

Pregnant or breast-feeding women or women not protected by effective contraceptive method of birth control.

The investigator will evaluate whether there are other reasons why a patient may not participate.

Efficacy and Safety of AVE1625 as a Co-treatment With Antipsychotic Therapy in Schizophrenia