Recent increases in the use of gamma hydroxybutyrate (GHB) in club and rave settings have been associated with a series of acute health problems including overdose. Drawing upon research recently completed in Melbourne, Australia among a sample of young club and rave patrons, this article explores the knowledge, attitudes and related "risk-behaviors " of individuals who use GHB, as well as the various cultures and contexts surrounding its use. A mixed quantitative and qualitative research design was utilized, comprising a detailed survey (N=923) and semistructured interviews (N=24). Almost all survey respondents reported to have consumed illicit drugs in the past, with around half reporting "lifetime" use of GHB. A quarter reported using GHB in the past year. GHB related harms were widely reported with 22% of GHB users reporting to have overdosed on the drug at least once. The article closes with recommendations for GHB specific prevention and harm reduction strategies.