 The purpose of this study is to characterize olanzapine pharmacokinetics: the inter- and intra- subject variabilities of olanzapine pharmacokinetics; and the potential influence of patient factors such as age, weight, gender, origin, and smoking status on olanzapine pharmacokinetics in adolescents with schizophrenia or bipolar I disorder. This study will also assess the safety of olanzapine delivered orally. 