By Dr Jack Dixon Freestone

Journal articles

Hudson-Buhagiar K; Brett J; Spillane A; Clay S; Freestone J; Clifford B; Riches-Evans S; Ezard N; Roberts DM; Race K; Siefried KJ, 2026, '‘A fine line between euphoria and death’: a qualitative study exploring gamma-hydroxybutyrate (GHB) use among people who identify as heterosexual living in Australia', Harm Reduction Journal, 23, http://dx.doi.org/10.1186/s12954-026-01405-1

Peacock A; Chrzanowska A; Man N; Darke S; Brown J; Grigg J; Dietze P; Ezard N; Bruno R; Siefried KJ; Salom C; Freestone J; Akhurst J; Tierney L; Sutherland R, 2026, 'Trends in gamma-hydroxybutyrate use, harms and treatment in Australia, 2013 to 2024', Addiction, 121, pp. 1290 - 1305, http://dx.doi.org/10.1111/add.70308

Wells N; Hammoud M; Carter A; Bavinton BR; Saliba B; Storer D; Freestone J; Haire B, 2026, 'Exploring Unwanted Sexual Encounters Among Gay, Bisexual, and other Men who have Sex with Men', Sexuality Research and Social Policy, pp. 1 - 10, http://dx.doi.org/10.1007/s13178-026-01332-7

Freestone J; MacDonald H; Kypri S; Clifford B; Siefried KJ; Ezard N, 2026, 'Exploring the Utility and Appropriateness of Dose Thresholds for Issuing of Public Drug Alerts on High-Dose MDMA: A Qualitative Study', Drug and Alcohol Review, 45, pp. e70140, http://dx.doi.org/10.1111/dar.70140

Clifford B; Bruno R; Acheson L; Cecilio ME; Siefried KJ; Freestone J; Cornelisse VJ; Crozier B; Bath N; Ezard N, 2026, 'Substance Use and Sex Index version 2 (SUSI-2): Validation of a brief questionnaire for the measurement of behaviours associated with transmission of blood borne viruses and sexually transmitted infections', Addiction, 121, pp. 670 - 679, http://dx.doi.org/10.1111/add.70253

Fletcher K; Freestone J; Clifford B; Ezard N; Kershaw S; Acheson LS; Karavasilis T; Siefried KJ, 2026, 'Digital health interventions for people who use methamphetamine: a scoping review', Frontiers in Psychiatry, 16, pp. 1658021, http://dx.doi.org/10.3389/fpsyt.2025.1658021

Freestone J; Zhou C; Kypri S; Howes M; Ebdon E; Purcell L; Dessauer P; Beckers C; Chapman B; Weith S; Lamb M; Clifford B; Siefried KJ; Barratt MJ; Peacock A; Sutherland R; Doumany J; Gava P; Standfield M; Kavanagh R; Dicka J; Sidaway P; Farah B; Ezard N, 2026, 'Incorporating experiential reports provided by people who use drugs into drug-related early warning systems: benefits, risks principles and approaches', International Journal of Drug Policy, 147, http://dx.doi.org/10.1016/j.drugpo.2025.105098

Freestone J; Siefried KJ; Drysdale K; Murray J; Ward J; Ezard N; Clifford B; Bourne A, 2026, 'Sex, Methamphetamine, and a Surge in Syphilis Among Women and Men Who Have Sex With Women: A Call to Diversify Research Addressing Sexualized Drug Use', Contemporary Drug Problems, http://dx.doi.org/10.1177/00914509261433267

Freestone J; Kypri S; Schumann JL; Franklin E; Francis C; Barratt MJ; Peacock A; Sutherland R; Clifford B; MacDonald H; Ezard N; Fletcher K; Acheson L; Siefried KJ, 2025, 'The Emergence of Novel Benzodiazepines in Australia, Evidence, Alerts, Clinical Management and Harm Reduction—A Narrative Review', Drug and Alcohol Review, 45, pp. e70086, http://dx.doi.org/10.1111/dar.70086

Freestone J; Storer D; Siefried KJ; Bourne A; Prestage G; Ezard N; Maher L; Stirling R; Xiao BJ; Murphy D; Degenhardt L; Hammoud M, 2025, 'Implementation and formative evaluation of a peer-led chemsex intervention targeting sexualised crystal methamphetamine and GHB use: the M3THOD study', Harm Reduction Journal, 22, pp. 181, http://dx.doi.org/10.1186/s12954-025-01329-2

Freestone J; Siefried KJ; Peacock A; Fletcher K; Barratt MJ; Sutherland R; Ezard N; Doumany J; MacDonald H; Kypri S; Acheson L; Clifford B, 2025, 'From environmental disasters to emerging drugs; a framework to understand, map and assess drug-related early warning systems', International Journal of Drug Policy, 145, pp. 104946, http://dx.doi.org/10.1016/j.drugpo.2025.104946

Clifton B; Keen P; Trevillyan J; Sullivan N; Johnson K; Warner M; Taheny C; Ellis H; Freestone J; Allan B; Newham B, 2025, 'Strategies to achieve the UNAIDS 95% HIV diagnosis target in Australia: Insights from a multidisciplinary roundtable', HIV Medicine, 26, pp. 3 - 16, http://dx.doi.org/10.1111/hiv.70083

Freestone J; Xiao BJ; Siefried KJ; Bourne A; Ezard N; Maher L; Stirling R; Degenhardt L; Varma R; Prestage G; Hammoud M; Varma R, 2025, 'Exploring experiences of talk therapies among gay and bisexual men seeking to reduce or abstain from using crystal methamphetamine in the context of chemsex', Drug and Alcohol Review, 44, pp. 711 - 722, http://dx.doi.org/10.1111/dar.13999

Siefried KJ; Hill P; Clifford B; Brown J; Camilleri A; Crawford S; Dessauer P; Dilkes-Frayne E; Freestone J; Gobeil J; Harrod ME; Hudson S; Hull P; Lenton S; Lyons T; Oh G; Peacock A; Pierce A; Sidaway P; Soderstrom J; Tzanetis S; Ezard N, 2025, 'Co-design of the Australian Prompt Response Network for a public-health focused intersectoral approach to information sharing on emerging drugs of concern', Frontiers in Public Health, 13, pp. 1521911, http://dx.doi.org/10.3389/fpubh.2025.1521911

Siefried KJ; Bascombe F; Clifford B; Liu Z; Middleton P; Kay-Lambkin F; Freestone J; Herman D; Millard M; Steele M; Acheson L; Moller C; Bath N; Ezard N, 2024, 'Effect of a Smartphone App (S-Check) on Actual and Intended Help-Seeking and Motivation to Change Methamphetamine Use Among Adult Consumers of Methamphetamine in Australia: Randomized Waitlist-Controlled Trial', Jmir Mhealth and Uhealth, 12, pp. e55663 - e55663, http://dx.doi.org/10.2196/55663

Freestone J; Ezard N; Bourne A; Brett J; Roberts DM; Hammoud M; Nedanoski A; Prestage G; Siefried KJ, 2023, 'Understandings, attitudes, practices and responses to GHB overdose among GHB consumers', Harm Reduction Journal, 20, pp. 121, http://dx.doi.org/10.1186/s12954-023-00857-z

Freestone J; Bourne A; Layard E; Prestage G; Murray J; Siefried KJ, 2022, 'Playing at the edges, navigating sexual boundaries, and narrating sexual distress; Practices and perspectives of sexuality and gender diverse people who use GHB', International Journal of Drug Policy, 108, pp. 103811, http://dx.doi.org/10.1016/j.drugpo.2022.103811

Freestone J; Prestage G; Bourne A; Ezard N; Race K; Nedanoski A; Murray J; Siefried KJ, 2022, 'Controlling for pleasure and risk: The experiences of sexuality and gender diverse people who use GHB', International Journal of Drug Policy, 105, pp. 103747, http://dx.doi.org/10.1016/j.drugpo.2022.103747

Freestone J; Siefried KJ; Prestage G; Hammoud M; Molyneux A; Bourne A, 2022, 'Individual level peer interventions for gay and bisexual men who have sex with men between 2000 and 2020: A scoping review', PLoS ONE, 17, http://dx.doi.org/10.1371/journal.pone.0270649

Freestone J; Mooney-Somers J; Hudson S, 2022, 'The sector is ready, and the community needs Australian alcohol and other drug treatment services to ask about sexuality and gender identity', Drug and Alcohol Review, 41, pp. 39 - 42, http://dx.doi.org/10.1111/dar.13367

Conference Presentations

Freestone J; Xiao BJ; Siefried K; Bourne A; Ezard N; Maher L; Stirling R; Degenhardt L; Varma R; Hammoud M, 2024, 'Exploring service experiences among gay and bisexual men seeking to reduce or abstain from chemsex', presented at Australasian Professional Society on Alcohol and other Drugs (APSAD) Scientific Conference 2024, Canberra, Australia, 30 October 2024 - 02 November 2024, http://dx.doi.org/10.1111/dar.13943

Freestone J; Siefried KJ; Bourne A; Hammoud M; Prestage G, 2021, 'Peer-led interventions addressing health and wellbeing for gay and bisexual men between 2000 and 2020: A scoping review', presented at Joint Australasian Sexual Health, HIV and AIDS Conferences, Virtual, 06 September 2021 - 09 September 2021

Conference Abstracts

Fletcher K; Freestone J; Clifford B; Ezard N; Kershaw S; Acheson L; Karavasilis T; Siefried K, 2025, 'Digital Health Interventions for People Who Use Methamphetamine: A Scoping Review', Sydney, Australia, presented at APSAD 2025 Conference, Sydney, Australia, 09 November 2025 - 12 November 2025, http://dx.doi.org/10.1111/dar.70014

Macdonald H; Kypri S; Clifford B; Siefried K; Ezard N; Freestone J, 2025, 'High-Dose MDMA Alerts at 150 Mg: Exploring the Utility and Appropriateness of Alert Thresholds', Sydney, Australia, presented at APSAD 2025 Conference, Sydney, Australia, 09 November 2025 - 12 November 2025, http://dx.doi.org/10.1111/dar.70014

Kypri S; Macdonald H; Broadbent E; Freestone J; Baird S; Clifford B; Siefried K; Ezard N; Gobeil J, 2025, 'High-Dose MDMA Pills, Heroin-Adulterated Stimulants and Nitazene Detections the Most Common Concerns; Reporting on Drug Alerts Issued in Australia for 2024', Sydney, Australia, presented at APSAD 2025 Conference, Sydney, Australia, 09 November 2025 - 12 November 2025, http://dx.doi.org/10.1111/dar.70014

Freestone J; Barratt M; Kypri S; Siefried K; Broadbent E; Macdonald H; Clifford B; Ezard N, 2025, 'Identifying Concerns and Collaborating for Rapid Response; Preliminary Findings From the Formative Evaluation of the Prompt Response Network', Sydney, Australia, presented at APSAD 2025 Conference, Sydney, Australia, 09 November 2025 - 12 November 2025, http://dx.doi.org/10.1111/dar.70014

Howes M; Zhou C; Kypri S; Ebdon E; Purcell L; Dessauer P; Beckers C; Chapman B; Weith S; Lamb M; Clifford B; Ezard N; Freestone J, 2025, 'Incorporating Lived-Living Experience Into Drug Monitoring Frameworks; Preliminary Insights From an Anecdotal Reporting System Co-Design Project', in Incorporating Lived-Living Experience Into Drug Monitoring Frameworks; Preliminary Insights From an Anecdotal Reporting System Co-Design Project, Sydney (Gadigal), Australia, presented at APSAD 2025 Conference, Sydney (Gadigal), Australia, 09 November 2025 - 12 November 2025, http://dx.doi.org/10.1111/dar.70014

Freestone J; Ezard N; Brett J; Roberts DM; Murray J; Prestage G; Hammoud M; Siefried KJ, 2022, '"Sometimes I have a duty of care not to call 000": Reported practices, attitudes and factors influencing consumer responses to GHB overdose', in DRUG AND ALCOHOL REVIEW, WILEY, Vol. 41, pp. S64 - S64, https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000862018700111&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1

Reports

Kypri S; Watson L; Siefried K; Freestone J; Ezard N, 2026, Prompt Response Network, Drug Alert Report Q4, 2025, UNSW, Sydney, http://dx.doi.org/10.26190/unsworks/32230

Kypri S; Siefried KJ; Clifford B; Ezard N; Freestone J, 2025, Prompt Response Network, Drug Alert Report Q3, 2025​, http://dx.doi.org/10.26190/unsworks/31734

Kypri S; Macdonald H; Siefried K; Broadbent E; Clifford B; Freestone J; Ezard N, 2025, Prompt Response Network, Drug Alert Report Q2, 2025​, http://dx.doi.org/10.26190/unsworks/31407

Kypri S; Macdonald H; Siefried KJ; Broadbent E; Baird S; Clifford B; Freestone J; Ezard N, 2025, Prompt Response Network, Drug Alert Report 2024, http://dx.doi.org/10.26190/unsworks/31298

Kypri S; Macdonald H; Broadbent E; Freestone J; Baird S; Clifford B; Siefried K; Ezard N, 2025, Prompt Response Network, Drug Alert Report Q1 2025, http://dx.doi.org/10.26190/unsworks/31225

Freestone J; Franklin E; Broadbent E; Brown J; Harvey C; Barratt MJ; Lyons T; Camilleri A; Mason C; Ezard N; Clifford B; Barratt M, 2025, Emerging Best Practices in the Design and Dissemination of Public Drug Warnings, http://dx.doi.org/10.26190/unsworks/30774

Media

Freestone J; Siefried K, 2025, More Australians are overdosing on GHB. But there are ways to reduce your risk, The Conversation, https://theconversation.com/more-australians-are-overdosing-on-ghb-but-there-are-ways-to-reduce-your-risk-253128

Freestone J; Prestage G; Bourne A; Ezard N; Race K; Nedanoski A; Murray J; Siefried K, 2022, VAN (Video Abstracts by NCCRED) - The GHB Cultures, Practices and Experiences study, http://dx.doi.org/10.26190/unsworks/30424

Preprints

Siefried KJ; Bascombe F; Clifford B; Liu Z; Middleton P; Kay-Lambkin F; Freestone J; Herman D; Millard M; Steele M; Acheson L; Moller C; Bath N; Ezard N, 2023, Effect of a Smartphone App (S-Check) on Actual and Intended Help-Seeking and Motivation to Change Methamphetamine Use Among Adult Consumers of Methamphetamine in Australia: Randomized Waitlist-Controlled Trial (Preprint), http://dx.doi.org/10.2196/preprints.55663

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