title: Antipsychotic medication coprescribing in a large state hospital system.
abstract: OBJECTIVE
  To systematically characterize antipsychotic medication coprescribing ('polypharmacy') in a large state hospital system.
  
  
  METHODS
  All antipsychotic prescriptions written for all adult in-patients (N = 8212) in New York state-run civil facilities for the year 1999 were identified using the Integrated Research Database (IRDB) created by the Information Systems Division of the Nathan Kline Institute for Psychiatric Research. Antipsychotics were considered to be intentionally coprescribed only when both were prescribed for an overlapping period of 28 days.
  
  
  RESULTS
  Coprescribing of typical, atypical, and depot antipsychotics comprised 31% of antipsychotic prescribing episodes. Medications were usually coprescribed with medications from outside their own antipsychotic class. Patient factors, such as age, diagnosis, and history of prior hospitalization, affected coprescribing rates (p < 0.001 for all indicated variables). Atypical antipsychotic medications were less likely to be given with another antipsychotic than were oral or depot typical medications.
  
  
  CONCLUSIONS
  Coprescribing of antipsychotic drugs is a common practice in the New York State hospital system. The analysis of large clinical databases can yield valuable information about the kinds of complex pharmacotherapy regimens actually utilized in the treatment of the most severely ill patients.
authors.affiliation: Nathan S. Kline Institute for Psychiatric Research, 140 Old Orangeburg Road, Orangeburg, NY 10962, USA. ajaffe@usa.net
authors.forename: Ari B
authors.initials: AB
authors.lastname: Jaffe
authors.forename: Jerome
authors.initials: J
authors.lastname: Levine
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D016208:Databases, Factual / Q000706:statistics & numerical data; D004359:Drug Therapy, Combination; D017723:Drug Utilization Review / Q000706:statistics & numerical data*; D005260:Female; D006778:Hospitals, Psychiatric / Q000706:statistics & numerical data; D006783:Hospitals, State / Q000706:statistics & numerical data; D006801:Humans; D007297:Inpatients; D008297:Male; D008875:Middle Aged; D009518:New York; D019338:Polypharmacy
chemical_list: D014150:Antipsychotic Agents