This summary talks about one type of medicine—antipsychotics— used to treat schizophrenia and bipolar disorder. It will tell you what research says about how older and newer antipsychotics compare for treating schizophrenia and bipolar disorder in adults. Please note that the research on antipsychotics as treatment for bipolar disorder is limited, and more research is needed. This summary will also tell you about the possible side effects of antipsychotics. It can help you talk with your doctor about whether or not one of these antipsychotic medicines might be right for you. This summary does not talk about medicines other than antipsychotics for schizophrenia or bipolar disorder, such as mood stabilizers or antidepressants. This summary also does not discuss nonmedicine treatments, such as psychotherapy.