“…MDMA and its analogues as MDA (3,4-methylenedioxyamphetamine) To gather information on ecstasy users in Brazil and specifically in the city of São Paulo surveys such as self-report questionnaires (Almeida, Silva, 2003;Almeida, Silva, 2005), interviews with users (Battisti et al, 2006) and also online questionnaires on a website set up specifically for this purpose (Almeida, Bizeto, Silva, 2007;Almeida, Garcia-Mijares, Silva, 2009) were carried out. As the source of information came from volunteers who chose to participate of their own free will and the online sample could have also been limited to individuals who had access to the internet, these studies may not be a representative of Brazilian ecstasy users.…”