Early Prediction of Clinical Response in Patients With Schizophrenia Treated by Paliperidone ER

Paliperidone ER is a new psychotropic medication for schizophrenia treatment. The studies of 6-week acute treatment and 52-week maintenance treatment showed positive results in patients with schizophrenia and its clinical improvement may start at Day 4. Some second-generation antipsychotics have been found that using the first 2 weeks' treatment results to predict the fourth or sixth week's treatment response is acceptable. The primary aim of this study is to investigate: 1. . whether the early prediction model used in other atypicals could also be applied in paliperidone ER. 2. . The changes of metabolic parameters and pharmacokinetics after paliperidone ER treatment in this study