title: The sources and popularity of online drug information: an analysis of top search engine results and web page views.
abstract: BACKGROUND
  The Internet has become a popular source of health information. However, there is little information on what drug information and which Web sites are being searched.
  
  
  OBJECTIVE
  To investigate the sources of online information about prescription drugs by assessing the most common Web sites returned in online drug searches and to assess the comparative popularity of Web pages for particular drugs.
  
  
  METHODS
  This was a cross-sectional study of search results for the most commonly dispensed drugs in the US (n=278 active ingredients) on 4 popular search engines: Bing, Google (both US and Canada), and Yahoo. We determined the number of times a Web site appeared as the first result. A linked retrospective analysis counted Wikipedia page hits for each of these drugs in 2008 and 2009.
  
  
  RESULTS
  About three quarters of the first result on Google USA for both brand and generic names linked to the National Library of Medicine. In contrast, Wikipedia was the first result for approximately 80% of generic name searches on the other 3 sites. On these other sites, over two thirds of brand name searches led to industry-sponsored sites. The Wikipedia pages with the highest number of hits were mainly for opiates, benzodiazepines, antibiotics, and antidepressants.
  
  
  CONCLUSIONS
  Wikipedia and the National Library of Medicine rank highly in online drug searches. Further, our results suggest that patients most often seek information on drugs with the potential for dependence, for stigmatized conditions, that have received media attention, and for episodic treatments. Quality improvement efforts should focus on these drugs.
authors.affiliation: Centre for Health Services and Policy Research, School of Population and Public Health, The University of British Columbia, Vancouver, British Columbia, Canada. mlaw@chspr.ubc.ca
authors.forename: Michael R
authors.initials: MR
authors.lastname: Law
authors.forename: Barbara
authors.initials: B
authors.lastname: Mintzes
authors.forename: Steven G
authors.initials: SG
authors.lastname: Morgan
mesh_terms: D054626:Consumer Health Information / Q000592:standards / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D004345:Drug Industry; D004346:Drug Information Services / Q000592:standards* / Q000706:statistics & numerical data*; D016568:Drugs, Generic / Q000145:classification / Q000378:metabolism; D020407:Internet / Q000592:standards / Q000706:statistics & numerical data; D055553:Prescription Drugs / Q000145:classification / Q000378:metabolism; D058996:Quality Improvement; D057386:Search Engine / Q000592:standards / Q000706:statistics & numerical data*
chemical_list: D016568:Drugs, Generic; D055553:Prescription Drugs