Patterns of prescription of four major antipsychotics: a retrospective study based on medical records of psychiatric inpatients.

Abstract

PURPOSE:

(1) To identify factors associated with the choice among the three atypical antipsychotics available in France (amisulpride, olanzapine, risperidone) and the typical antipsychotic of reference: (haloperidol), (2) to compare psychotropic co-prescription rates according to antipsychotic.

METHODS:

All antipsychotic prescriptions including at least one of the four antipsychotics (n=421) for all inpatients (n=372) hospitalized 24 hours or more in the 6 months previous to the start of the study were included (2003). Data were obtained from medical records and psychiatrist interviews. Of the prescriptions, 13.3% included amisulpride, 39.4% olanzapine, 27.3% risperidone, and 20.0% haloperidol. Mean dosages were 142 mg (amisulpride), 15 mg (olanzapine), 4.5 mg (risperidone), and 19.5 mg (haloperidol).

RESULTS:

Differences between antipsychotics were observed in relation to patients' age (younger patients prescribed amisulpride and olanzapine, p=0.04), diagnoses (affective disorders more frequently prescribed olanzapine and risperidone, p=0.005), and mode of hospitalization (admissions under constraint more frequently prescribed haloperidol, p<0.001). Antidepressant and anxiolytic-hypnotic co-prescription rates were lower with haloperidol than with atypicals. Mood-stabilizer co-prescription rates were higher for olanzapine and risperidone than for haloperidol and amisulpride. Anticholinergic co-prescription was higher with haloperidol than with atypicals (p<0.001).

CONCLUSIONS:

Haloperidol was prescribed to a minority and targeted male patients hospitalized under constraint, using high dosages. Type and rate of co-prescriptions varied considerably between haloperidol and atypicals.

• Authors: I Gasquet, C Gury, S Tcherny-Lessenot, A Quesnot, P Gaudebout
• Journal: Pharmacoepidemiology and drug safety (Pharmacoepidemiol Drug Saf) Vol. 14 Issue 11 Pg. 805-11 (Nov 2005) ISSN: 1053-8569 [Print] England
• PMID: 16015580 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright (c) 2005 John Wiley & Sons, Ltd.

Chemical References

• Antipsychotic Agents

Topics

• Adult
• Antipsychotic Agents (administration & dosage, therapeutic use)
• Drug Prescriptions (statistics & numerical data)
• Drug Utilization Review (statistics & numerical data)
• Female
• Humans
• Male
• Medical Records
• Mental Disorders (drug therapy)
• Practice Patterns, Physicians'
• Retrospective Studies