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To describe (i) self‐reported changes in drug use and (ii) trends in price, perceived availability, and perceived purity of illicit drugs, among people who regularly use ecstasy/ 3,4‐methylenedioxymethamphetamine (MDMA) and other illicit stimulants in Australia following COVID‐19 and associated restrictions.

Annual interviews with cross‐sectional sentinel samples conducted face‐to‐face in 2016–19 and via video conferencing or telephone in 2020. Data were collected via an interviewer‐administered structured questionnaire.

Australian capital cities.

Australians aged 16 years or older who used ecstasy/MDMA and other illicit stimulants on a monthly or more frequent basis and resided in a capital city, recruited via social media and word‐of‐mouth (n ~ 800 each year).

Key outcome measures were self‐reported illicit drug market indicators (price, purity and …