Multiple Ascending Dose Study on Safety, Tolerability, and Pharmacokinetics of AMG 581 in Healthy Subjects or Subjects With Schizophrenia or Schizoaffective

The purpose of this study is to evaluate the safety, tolerability, and pharmacokinetic profile of ascending multiple oral doses of AMG 581 in healthy subjects or subjects with schizophrenia or schizoaffective disorder on antipsychotic medication. The study will also assess the effects of AMG 581 on midazolam PK in healthy subjects or subjects with schizophrenia or schizoaffective disorder on antipsychotic medication.