Study to Assess the Efficacy, Safety, and Tolerability of AZD8529 in Adult Schizophrenia Patients

Inclusion Criteria: * Patient will need to read, understand and sign an informed consent prior to any study specific procedures * Patient will have certain schizophrenia symptoms deemed by the investigator as appropriate for the study entry Exclusion Criteria: * Patients will be excluded based on recent history of significant illness or current disease as assessed by the investigator during screening process (based on physical examination, laboratory studies and electrocardiogram studies) * Patients will be excluded if urine drug screen test show positive results * Smoking of more than 2 packs of cigarettes a day