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

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