A growing number of psychotropic agents—mood stabilizers (including anticonvulsants), antipsychotics, and antidepressants—are being used to treat bipolar disorder, both alone and in combination. A study of nearly 1,500 Medicaid beneficiaries in California who had bipolar disorder found a shift between 2001 and 2004 toward greater use of antipsychotics; mood stabilizer monotherapy declined and antipsychotic monotherapy increased; racial-ethnic disparities in medication use were also noted (page 1169). A study of nearly 7,500 patients with newly diagnosed bipolar disorder who were enrolled in a national health plan showed that a third were started on polytherapy and a third were still receiving polytherapy at one year; 37% were not taking any psychotropic at one year (page 1175). Of 10,636 privately insured adults with posttraumatic stress disorder (PTSD), 60% were being treated with psychotropic medication; three-quarters of this group received antidepressants, and a similar proportion received anxiolytics or sedative-hypnotics (page 1184).