title: Is online information on ecstasy tablet content safe?
abstract: In recent years, the prevalence of ecstasy use has increased in most European countries. Users can acquire information on ecstasy tablet composition through the internet. This study compares online information from two websites, Pillreports and Partyflock, to the validated Dutch Drugs Information and Monitoring System (DIMS) database, and aims to measure its accuracy and potential danger or value.
  
  
  
  The drug-related information posted on Pillreports.net and Partyflock.nl between 1 January 2014 and 31 December 2015 was investigated for accuracy and several information characteristics such as picture inclusion and dose range inclusion. In total, 471 informatory statements on ecstasy tablet content were analysed relative to the Dutch ecstasy market.
  
  
  
  Informatory statements on the content of specific ecstasy tablets were scored as 'too high' or 'too low' if their concentrations deviated > 10 mg from the entries in the DIMS database within a 12-week time-frame, and scored as 'dangerous' if their concentration was > 40 mg too low. Unreported substances were scored as 'dangerous' if listed as an illegal or dangerous substance in the DIMS database and if present in relevant quantities. Also scored were the report characteristics 'picture inclusion', 'spread inclusion' and 'website source', which were tested for their association with report safety/danger.
  
  
  
  On average, reports on ecstasy tablets from Pillreports and Partyflock show concentrations which are 10.6 mg too high [95% confidence interval (CI) = 6.7-14.4]. Qualitatively, 39.7% of the reports scored as 'too high' (95% CI = 35.2-44.4), 17.6% scored as 'too low' (95% CI = 14.0-21.2) and 15.5% had 'unreported substances' (95% CI = 12.3-18.9), resulting overall in 15.3% of the reports being scored as 'dangerous' (95% CI = 11.9-18.5). The report characteristic 'spread inclusion' associated inversely with report danger [Exp(b) = 0.511, 95% CI = 0.307-0.850, P = 0.01].
  
  
  
  Information from the popular Pillreports and Partyflock websites tends to overestimate 3,4-methylenedioxymethamphetamine (MDMA) concentrations in ecstasy tablets. In addition, 15.3% of the reports omit the relevant concentration spread, fail to report additional illegal or dangerous substances contained in the tablets or underestimate MDMA concentration by > 40 mg.
authors: Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands.
authors: Ruben Q
authors: RQ
authors: Vrolijk
authors: Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands.|Academic Medical Centre, Department of Psychiatry, Amsterdam, the Netherlands.
authors: Tibor M
authors: TM
authors: Brunt
authors: Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands.|Department of Psychology, Section Health, Medical and Neuropsychology, Leiden University, the Netherlands.
authors: Annabel
authors: A
authors: Vreeker
authors: Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands.|Faculty of Management, Science and Technology, School of Science, Open University of the Netherlands, Heerlen, the Netherlands.
authors: Raymond J M
authors: RJ
authors: Niesink
mesh_terms: D006213:Hallucinogens / Q000032:analysis*; D006801:Humans; D013287:Illicit Drugs / Q000032:analysis*; D020407:Internet; D018817:N-Methyl-3,4-methylenedioxyamphetamine / Q000032:analysis*; D009426:Netherlands
chemical_list: D006213:Hallucinogens; D013287:Illicit Drugs; D018817:N-Methyl-3,4-methylenedioxyamphetamine
keywords: DIMS; Ecstasy; MDMA; internet; online information; pill reports