Wu, Li-TzyRingwalt, Christopher LMannelli, PaoloPatkar, Ashwin A2020-02-032020-02-032008-091055-04961521-0391https://hdl.handle.net/10161/20016We investigated the prevalence, patterns, and correlates of past-year DSM-IV hallucinogen use disorders (HUDs) among past-year users of MDMA and other hallucinogens from a sample of Americans 18 or older (n = 37,227). Users were categorized as MDMA users and other hallucinogen users. Overall, one in five (20%) MDMA users and about one in six (16%) other hallucinogen users reported at least one clinical feature of HUDs. Among MDMA users, prevalence of hallucinogen abuse, subthreshold dependence, and dependence was 4.9%, 11.9%, and 3.6%, respectively. The majority with hallucinogen abuse displayed subthreshold dependence. Most with hallucinogen dependence exhibited abuse. Subthreshold hallucinogen dependence is relatively prevalent and represents a clinically important subgroup that warrants future research and consideration in a major diagnostic classification system.HumansSubstance-Related DisordersN-Methyl-3,4-methylenedioxyamphetamineHallucinogensPrevalenceDiagnostic and Statistical Manual of Mental DisordersAdolescentAdultChildFemaleMaleYoung AdultJournal article2020-02-03