The Ecstasy and Related Drugs Reporting System (EDRS, formerly the Party Drugs Initiative or PDI) is a companion project to the Illicit Drug Reporting System (IDRS). The IDRS focuses on drugs such as methamphetamine, opioids, cannabis, and cocaine, and issues that pertain particularly to intravenous drug use in Australia. In contrast, the EDRS aims to examine emerging trends in the use, price, purity and availability of ecstasy and related drugs (ERD) in Australia. ERD are defined as drugs commonly used recreationally in the context of venues such as nightclubs and dance- or music-related events. These drugs primarily include ecstasy, methamphetamine, cocaine, d-lysergic acid (LSD), ketamine, gamma-hydroxy-butyrate (GHB) and novel psychoactive substances (NPS).