A Comparative Study of Patient Satisfaction Between Continued Administration of Previous Antipsychotics Versus Switched Administration to Paliperidone ER in Non-satisfied Patients With Previous Antipsychotic Drug

Inclusion Criteria: * Must be diagnosed with schizophrenia according to the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria * Have taken atypical antipsychotics (aripiprazole, olanzapine, risperidone) at least 6 weeks prior to start of study. * Have Medication Satisfaction Questionnaire (MSQ) score of ≤3 * Competent patients who manage to answer the questionnaires Exclusion Criteria: * Have had a history or current symptoms of tardive dyskinesia or neuroleptic malignant syndrome * Have had relevant history of or current presence of any significant or unstable cardiovascular, respiratory, neurological (including seizures or significant cerebrovascular), renal, hepatic, hematologic, endocrine, immunologic, morbid obesity (BMI≥40), or other systemic disease * Had received two or more different kind of antipsychotics. * Had a history of taking paliperidone extended release (ER). * Allergy or hypersensitivity to risperidone or paliperidone ER. * Have been on clozapine or long-acting injectable antipsychotic medication during the last 3 months. * Have had Medication Satisfaction Questionnaire (MSQ) score\>3 * Have been hospitalized for longer than 8 continuous weeks during the past 6 months * Had history of any severe preexisting gastrointestinal narrowing (pathologic or iatrogenic) or inability to swallow the oral tolerability medication whole with the aid of water for patients requiring oral tolerability testing * Current substance dependence (DSM-IV) or past history of dependence (more than 6 months)