Efficacy and Safety of A-prexa Compared to Zyprexa in Patients With Schizophrenia

Inclusion Criteria: * 20 years to 65 years * Schizophrenia patient with an acute exacerbation * Understand the requirement of the study and voluntarily consent to participate in the study Exclusion Criteria: * Patients who have another psychiatric disorders * Patients who have unstable medical conditions * Patients who have clinically important abnormalities of liver function test (\>2.5 fold of upper normal limit), ECG and vital sign at screening visit * Uncontrolled diabetic patients (plasma glucose level is more than 126 mg/dl in fasting condition) * Patients who have a history of an allergic reaction to olanzapine * Patient who have no clinical response to take two or more different atypical anti-psychotics for more than 4 weeks. * Patient who take clozapine within 12 weeks before screening visit