By Dr Brendan Clifford

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

Acheson LS; Siefried KJ; Clifford B; Steele M; Fletcher K; Ezard N, 2026, 'People Seeking Treatment for Meth/Amphetamine Use Are Getting Older and Treatment Services Need to Adapt', Drug and Alcohol Review, 45, pp. e70238, http://dx.doi.org/10.1111/dar.70238

Clifford B; Deacon RM; Mammen K; Siefried KJ; Ezard N; Lintzeris N, 2026, 'Assessing the Concurrent Validity of the Australian Treatment Outcomes Profile in a Methamphetamine Dependent Treatment‐Seeking Population', Drug and Alcohol Review, 45, http://dx.doi.org/10.1111/dar.70224

Freestone J; Siefried KJ; Ezard N; Brown JA; Peacock A; Griffiths P; Gough C; Barratt MJ; Kypri S; Lyons T; Harvey CA; Clifford B, 2026, 'Building trust for rapid response: Examining how network collaboration operates within Australian drug-related early warning systems', International Journal of Drug Policy, 155, pp. 105430 - 105430, http://dx.doi.org/10.1016/j.drugpo.2026.105430

Holman T; Macdonald P; Slade D; Goncharov L; Middleton S; Watts GJ; Williams M; Carr G; Mitchell I; McErlean G; Sheppard-Law S; Jones K; Paull G; Templeton N; Rayner S; Davis S; Gao Y; You W; Kennedy R; Clifford B; Proctor R; Algoso C; Ng P; Myhill B; Lowe D; Devlin E; Lennox K; McVeigh J; Ryan M; Straiton N, 2026, 'Improving End-of-Life Care for Patients in Australian Cardiology Wards: A Retrospective Medical Record Audit', Heart Lung and Circulation, 35, pp. 845 - 854, http://dx.doi.org/10.1016/j.hlc.2026.04.111

Matepi QGJ; Clifford B; Acheson LS; McKetin R; Montebello M; Siefried KJ; Chan DKE; Olsen N; May R; Ezard N, 2026, 'Insomnia is associated with psychological distress in individuals with methamphetamine dependence', Australasian Psychiatry, 34, pp. 246 - 252, http://dx.doi.org/10.1177/10398562251406035

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

Smylie CS; Moller CI; McWilliams L; Clifford B; Acheson L; Chambers M; Siefried KJ; Brett J; Shakeshaft A; Roberts DM; Corliss C; Rich J; Clark SC; Manzie R; Dunlop A; Speirs B; Kay‐Lambkin F; Ezard N, 2026, 'Expanding Access to Addiction Medicine Specialist Care in Regional New South Wales, Australia Through Telehealth', Drug and Alcohol Review, 45, http://dx.doi.org/10.1111/dar.70101

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, pp. 105098, http://dx.doi.org/10.1016/j.drugpo.2025.105098

Fletcher K; Ezard N; Siefried KJ; van der Helder S; Freestone J; Brett J; May R; Acheson L; Clifford B, 2026, 'Navigating ‘k-land’: a qualitative exploration of participants’ experiences of ketamine-assisted psychotherapy for methamphetamine use disorder', Frontiers in Psychiatry, 17, pp. 1873497, http://dx.doi.org/10.3389/fpsyt.2026.1873497

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

Clifford B; Searby A, 2026, 'Nursing Preparedness for Emerging Drugs of Concern.', Journal of Addictions Nursing, 37, pp. 1 - 3, http://dx.doi.org/10.1097/jan.0000000000000668

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, http://dx.doi.org/10.1111/dar.70086

Acheson LS; Siefried KJ; Lintzeris N; Dunlop AJ; Haber PS; Arunogiri S; Christmass M; Doyle M; Donoghoe M; Nagle J; Clifford B; McKetin R; Lubman DI; Brett J; Taylor N; Carr A; Levin FR; Shoptaw S; Ezard N, 2025, 'Study protocol for a randomised controlled trial to determine the efficacy of lisdexamfetamine for the treatment of acute methamphetamine withdrawal in inpatient settings', BMJ Open, 15, pp. e107242 - e107242, http://dx.doi.org/10.1136/bmjopen-2025-107242

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

Chalabianloo F; Fadnes LT; Mordal J; Spigset O; Løberg EM; Halmøy A; Lid TG; Andersen CD; Daltveit JT; Assmus J; Erga AH; Solli KK; Askjer JF; Hansen MAK; Ohldieck C; Ezard N; Lintzeris N; Johansson KA; Siefried K; Clifford B, 2025, 'Impact of dextroamphetamine substitution on the use of illicit amphetamines in adults with amphetamine dependence: a study protocol for the multicentre double blind randomised controlled trial ATLAS4Dependence', BMJ Open, 15, pp. e095383, http://dx.doi.org/10.1136/bmjopen-2024-095383

Ezard N; Siefried KJ; Clifford B, 2025, 'Commentary on Young et al.: Clinical guidance is required for stimulant co-prescription with opioid agonist therapy', Addiction, 120, pp. 1195 - 1197, http://dx.doi.org/10.1111/add.70061

Clifford B; Peacock A; Siefried KJ; Gobeil J; Smith JL; Ezard N, 2025, 'Responding to reports of nitazene toxicity in Australia', Medical Journal of Australia, 222, pp. 216 - 219, http://dx.doi.org/10.5694/mja2.52605

Fletcher K; Ezard N; Siefried KJ; MacDonald H; Acheson L; Bedi G; Guerin A; Knock E; Millard M; May R; Brett J; Doumany J; Morgan C; Clifford B, 2025, 'Protocol of an open-label safety and feasibility pilot study of ketamine-assisted psychotherapy for methamphetamine use disorder (the KAPPA trial)', BMJ Open, 15, pp. e092504, http://dx.doi.org/10.1136/BMJOPEN-2024-092504

Siefried KJ; Acheson L; Clifford B; Moller C; Brett J; Christmass M; Dunlop AJ; Haber PS; Jutras-Aswad D; Lintzeris N; Morley K; Shoptaw S; Trivedi MH; Ezard N, 2025, 'Trial protocol of an open-label pilot study of oral naltrexone–bupropion combination pharmacotherapy for the treatment of methamphetamine use disorder (the NABU trial)', BMJ Open, 15, pp. e092032, http://dx.doi.org/10.1136/BMJOPEN-2024-092032

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

Ezard N; Clifford B; Siefried KJ; Ali R; Dunlop A; McKetin R; Bruno R; Carr A; Ward J; Farrell M; Graham R; Haber P; Lubman D; Donoghoe MW; Olsen N; Baker A; Hall M; Arunogiri S; Lintzeris N; Gill A; Rodgers C; Montebello M; Liaw W; Liu Z, 2025, 'Lisdexamfetamine in the treatment of methamphetamine dependence: A randomised, placebo-controlled trial', Addiction, 120, pp. 1345 - 1359, http://dx.doi.org/10.1111/add.16730

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

Clifford B; Van Gordon K; Magee F; Malone V; Siefried KJ; Graham D; Ezard N, 2023, '“There’s a big tag on my head”: exploring barriers to treatment seeking with women who use methamphetamine in Sydney, Australia', BMC Health Services Research, 23, pp. 162, http://dx.doi.org/10.1186/s12913-023-09125-z

Bascombe F; Siefried KJ; Clifford B; Child S; Loos R; Sgouras H; Stevens L; Wilson H; Ezard N, 2023, 'Methamphetamine and emerging drugs of concern: A training needs analysis of Australian alcohol and other drug helplines', Drug and Alcohol Review, 42, pp. 1744 - 1753, http://dx.doi.org/10.1111/dar.13719

Clifford B; Wood L; Vallesi S; Macfarlane S; Currie J; Haigh F; Gill K; Wilson A; Harris P, 2022, 'Integrating healthcare services for people experiencing homelessness in Australia: key issues and research principles', Integrated Healthcare Journal, 4, pp. e000065, http://dx.doi.org/10.1136/ihj-2020-000065

Acheson LS; Siefried KJ; Clifford B; Murray E; Steele M; Clague L; Malone V; Roberts DM; Ferguson LJ; Matthews GV; Ezard N, 2021, 'One-third of people who inject drugs are at risk of incomplete treatment for Staphylococcus aureus bacteraemia: a retrospective medical record review', International Journal of Infectious Diseases, 112, pp. 63 - 65, http://dx.doi.org/10.1016/j.ijid.2021.09.012

Ezard N; Clifford B; Dunlop A; Bruno R; Carr A; Liu Z; Siefried KJ; Lintzeris N, 2021, 'Safety and tolerability of oral lisdexamfetamine in adults with methamphetamine dependence: A phase-2 dose-escalation study', BMJ Open, 11, pp. e044696, http://dx.doi.org/10.1136/bmjopen-2020-044696

Clifford B; Wilson A; Harris P, 2019, 'Homelessness, health and the policy process: A literature review', Health Policy, 123, pp. 1125 - 1132, http://dx.doi.org/10.1016/j.healthpol.2019.08.011

Malone V; Ezard N; Clifford B; Middleton S; McInnes E; Bonevski B, 2019, 'A systems change intervention for nurse-led smoking cessation care in hospitals', Collegian, 26, pp. 235 - 241, http://dx.doi.org/10.1016/j.colegn.2018.07.007

Ezard N; Dunlop A; Hall M; Ali R; McKetin R; Bruno R; Phung N; Carr A; White J; Clifford B; Liu Z; Shanahan M; Dolan K; Baker AL; Lintzeris N, 2018, 'LiMA: A study protocol for a randomised, double-blind, placebo controlled trial of lisdexamfetamine for the treatment of methamphetamine dependence', BMJ Open, 8, http://dx.doi.org/10.1136/bmjopen-2017-020723

Ezard N; Webb B; Clifford B; Cecilio ME; Jellie A; Lea T; Rodgers C; Ruth S; Bruno R, 2018, 'Substance Use and Sex Index (SUSI): First stage development of an assessment tool to measure behaviour change in sexualised drug use for substance use treatment studies', International Journal of Drug Policy, 55, pp. 165 - 168, http://dx.doi.org/10.1016/j.drugpo.2018.03.020

Ezard N; Cecilio ME; Clifford B; Baldry E; Burns L; Day CA; Shanahan M; Dolan K, 2018, 'A managed alcohol program in Sydney, Australia: Acceptability, cost-savings and non-beverage alcohol use', Drug and Alcohol Review, 37, pp. S184 - S194, http://dx.doi.org/10.1111/dar.12702

Ezard N; Dunlop A; Clifford B; Bruno R; Carr A; Bissaker A; Lintzeris N, 2016, 'Study protocol: A dose-escalating, phase-2 study of oral lisdexamfetamine in adults with methamphetamine dependence', BMC Psychiatry, 16, http://dx.doi.org/10.1186/s12888-016-1141-x

Ezard N; Dunlop AJ; Clifford B; Bruno R; Carr A; Bissaker A; Lintzeris N, 2016, 'LISDEX I: DOSE-ESCALATING, PHASE-2 STUDY OF ORAL LISDEXAMFETAMINE IN ADULTS WITH METHAMPHETAMINE DEPENDENCE', DRUG AND ALCOHOL REVIEW, 35, pp. 36 - 36, https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000398381500098&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=891bb5ab6ba270e68a29b250adbe88d1

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