Effectiveness of Atypical Antipsychotics on Anhedonic Features in Patients With Schizophrenia

Inclusion Criteria: * Documented clinical diagnosis of schizophrenia meeting the Diagnostic and Statistical Manual of Mental Disorders,(DSM-IV-TR) criteria * Patients who already take one atypical at inclusion it is started at least 1 week and up to 4 weeks before the inclusion Exclusion Criteria: * Meeting the criteria for any other (than schizophrenia) DSM-IV Axis I * Patients with antipsychotic combinations (more than two agents) * Patients who are already on any mood stabilizers and antidepressant * Known lack of response to clozapine or treatment with clozapine within 4 weeks prior to enrollment * Patients who have been treated with antipsychotics in depot formulations for the last two months * Previous enrollment or randomisation of treatment in the present NIS * Patients who had participated in other clinical trials within 4 weeks prior to enrollment period * Pregnant women or women who are breast-feeding