Patient characteristics and prescription patterns of atypical antipsychotics among patients with schizophrenia
Article first published online: 11 DEC 2002
Journal of Clinical Pharmacy and Therapeutics
Volume 27, Issue 6, pages 441–451, December 2002
How to Cite
Ren, X. S., Kazis, L. E., Lee, A. F., Hamed, A., Huang, Y. H., Cunningham, F. and Miller, D. R. (2002), Patient characteristics and prescription patterns of atypical antipsychotics among patients with schizophrenia. Journal of Clinical Pharmacy and Therapeutics, 27: 441–451. doi: 10.1046/j.1365-2710.2002.00443.x
- Issue published online: 11 DEC 2002
- Article first published online: 11 DEC 2002
- Received 12 August 2002, Accepted 13 October 2002
- atypical antipsychotics;
- patient characteristics;
- prescription patterns;
Background: Schizophrenia, one of the leading causes of disability, contributes substantially to the use of medical and mental health services. The treatment of schizophrenia is therefore particularly important to reduce deficits across a large number of neurocognitive domains.
Objective: To describe the prescription (e.g. initiation and switching) patterns of atypical antipsychotic agents and examine the extent to which patient sociodemographic and clinical characteristics are associated with the prescription patterns of atypical antipsychotics among patients with schizophrenia.
Methods: Using unique data sources from the Veterans Health Administration (VA), the study identified 89 107 patients with schizophrenia based on at least one inpatient or more than or equal to two outpatients' ICD-9-CM codes (≥7 days apart). We defined a prior 6-month (1/1/99 to 6/30/99) and a post 6-month (7/1/99 to 12/31/99) period to describe patterns of initiation and switching of atypical antipsychotics.
Results: Only a small number of patients were on clozapine (1·8%) and quetiapine (1·4%). More patients were prescribed olanzapine (23%) than risperidone (20%) (P < 0·001). Compared with patients who were on risperidone, those who were on olanzapine were younger (P < 0·001), more likely Hispanic (P < 0·001), more likely married (P < 0·05), had more service-connected disability (P < 0·001), had fewer numbers of physical comorbidities (P < 0·001), and a lower body mass index (BMI) (P < 0·05).
Conclusion: Olanzapine and risperidone appear to be prescribed to patients with different sociodemographic and clinical characteristics. Future research needs to explore the reasons for those differences.