title: Influence of commercial information on prescription quantity in primary care.
abstract: BACKGROUND
  In the last few years we have witnessed many publicly-financed health services reaching a crisis point. Thus, drug expenditure is nowadays one of the main concerns of health managers, and its containment one of the first goals of health authorities in western countries. The objective of this study is to identify the effect of the perceived quality stated in commercial information, its uses, and how physicians perceive the influence it has on prescription amounts.
  
  
  METHODS
  A cross-sectional study of 405 primary care physicians was conducted in Galicia (north-west Spain). The independent variables physician's education and speciality, physician's perception of the quality of available drug information sources, type of practice, and number of patients were collected, through a postal questionnaire. Environmental characteristics of the practice were obtained from secondary sources. Multiple regression models were constructed using as dependent variables two indicators of prescription volume.
  
  
  RESULTS
  The response rate was 75.2%. Prescription amounts was found to be associated with perceived credibility of information provided by medical visitors, regulated physician training, and environmental characteristics of the practice (primary care team practice, urban environment).
  
  
  CONCLUSIONS
  The study results suggest that in order to decrease prescription amounts it is necessary to limit the role of pharmaceutical companies in physician training, improve physician education and training, and emphasize more objective sources of information.
authors.affiliation: Department of Preventive Medicine and Public Health, University of Santiago de Compostela, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Caamaño
authors.forename: Adolfo
authors.initials: A
authors.lastname: Figueiras
authors.forename: Juan Jesus
authors.initials: JJ
authors.lastname: Gestal-Otero
mesh_terms: D001291:Attitude of Health Personnel; D003363:Cost Control; D003430:Cross-Sectional Studies; D016527:Drug Costs; D004345:Drug Industry; D004346:Drug Information Services / Q000592:standards*; D004363:Drug Utilization / Q000191:economics / Q000706:statistics & numerical data*; D005260:Female; D006302:Health Services Research; D006801:Humans; D008297:Male; D040541:Marketing; D010821:Physicians, Family / Q000523:psychology* / Q000706:statistics & numerical data; D011320:Primary Health Care / Q000592:standards*; D013030:Spain; D011795:Surveys and Questionnaires