McIntyre RS

Department of Pharmacology and Toxicology, University of Toronto, Toronto, Canada; Department of Psychiatry, University of Toronto, Toronto, Canada. Electronic address: roger.mcintyre@bcdf.org.

81 papers · 3 preprints · ORCID

ArticleDMT

Pharmacological, clinical, and translational evidence for N,N-dimethyltryptamine, 5-methoxy-N,N-dimethyltryptamine, and zalsupindole: a systematic review.

Collyer C, Le GH, Hassan M +2

Europe PMC2026
ArticleKetamine

Cognitive effects of ketamine and esketamine treatment for major depressive and bipolar disorder: a systematic review.

Xiao K, Woo Y, Dri CE +12

Europe PMC2026
ArticleKetamine

The effect of ketamine on mitochondrial bioenergetics, viability, and function: A systematic review.

Wong S, Le GH, Selby S +7

Europe PMC2026
ArticleKetamine

Serial Ketamine Infusions for Treatment-Resistant Bipolar Depression: A Randomized Clinical Trial.

Orsini DK, Di Luch S, Tomlinson G +18

Europe PMC2026
ArticleKetamine

Psychedelics in psychiatry: comparative effectiveness, implementation, commercialization and safety lessons learned from intranasal esketamine.

McIntyre RS

Europe PMC2026
ArticleKetamine

A Systematic Review of Long-Term Safety Outcomes of Ketamine and Esketamine in Patients with Treatment-Resistant Depression.

Wasolua TT, Hardy MS, Bommersbach TJ +2

Europe PMC2026
ArticleKetamine

Adjunctive Pharmacotherapy for Major Depressive Disorder with Anxiety Symptoms: from Monoamines to Recent Clinical Evidence.

McIntyre RS, Kato M, Thase ME +5

Europe PMC2026
ArticleKetamine

A scoping review: ketamine or esketamine when used to assist psychotherapy or in combination with psychotherapy for the management of depression in adults.

Swainson J, Grewal P, Polard S +9

Europe PMC2026
PreprintKetamine

Elunetirom, a brain-targeted TRβ prodrug, promotes neuronal plasticity and mitochondrial biogenesis-related signaling in primary neuronal cultures

Harris JR, Baccei J, Stratton W +4

Europe PMC2026
ArticleKetamine

Ketamine Infusions and Rapid Reduction of Suicidal and Depressive Symptoms in Major Depressive Episode: A Systematic Review and Meta-Analysis.

Shim SR, Jeong HS, Bommersbach TJ +7

Europe PMC2026
ArticlePsilocybin

Blinding Integrity in Psychedelic Randomized Clinical Trials: A Systematic Review.

Orsini DK, Wong S, Di Luch S +15

Europe PMC2026
ArticleKetamine

Evaluating the abuse liability of ketamine in the treatment of mood disorders: A systematic review.

Vasudeva S, Lovell GFM, Wong S +5

Europe PMC2026
ArticleKetamine

Trajectory of response to esketamine nasal spray for treatment resistant depression: Findings from ESCAPE-TRD.

Young AH, Bartova L, Cardoner N +9

Europe PMC2026
ArticleMDMA

The Serotonin 2B (5-HT2B) Receptor: A Narrative Review of Preclinical and Clinical Evidence on the Safety Considerations and Therapeutic Potential for the Treatment of Depression.

Le GH, Wong S, Johnson DE +6

Europe PMC2026
PreprintKetamine

Structural Neurotoxic and Neuroprotective Effects of Ketamine and Esketamine in Preclinical and Human Studies: A Systematic Review

Wasolua TT, Bommersbach TJ, McIntyre RS +1

Europe PMC2026
ArticleKetamine

Evaluating the potential risk of ketamine-induced hepatotoxicity in the treatment of mood and anxiety disorders: A systematic review.

Lovell GFM, Vasudeva S, Orsini DK +6

Europe PMC2026
ArticleKetamine

Effect of ketamine on reward processing in depressive disorders: a systematic review of neuroimaging studies.

Faisal H, Le GH, Kwan ATH +10

Europe PMC2026
ArticleKetamine

Are the current safety measures for the treatment of depression with esketamine sufficient?

Valentino K, Teopiz KM, Dri CE +3

Europe PMC2026
ArticleKetamine

The use of repetitive transcranial magnetic stimulation (rTMS), electroconvulsive therapy (ECT), ketamine, and esketamine in reducing suicidality in major depressive disorder: A comprehensive narrative review.

Menon T, Lu A, Arulmozhi A +7

Europe PMC2026
ArticleKetamine

The effect of glutamatergic modulators on sleep behavior and architecture in depressive disorders: A systematic review.

Valentino K, Ballum H, Cheung W +11

Europe PMC2026
ArticlePsilocybin

Examining the effects of psilocybin-assisted psychotherapy on anhedonia in treatment-resistant depression.

Kaczmarek ES, Rodrigues NB, Chisamore N +8

Europe PMC2026
ArticlePsilocybin

Cardiac Consequences Associated with Psychedelic Use: A Systematic Review of Lysergic Acid Diethylamide, 3,4-Methylenedioxymethamphetamine, and 5-Hydroxytryptamine 2B-Mediated Valvular Heart Disease.

Xu T, Wong S, Le GH +9

Europe PMC2026
ArticleKetamine

Is the antidepressant efficacy of ketamine and esketamine mediated via opioid mechanisms?

Lu A, Xu H, Le GH +9

Europe PMC2026
ArticleKetamine

Modulating tonic NMDA receptor currents: mechanistic insights into ketamine, esketamine, and dextromethorphan for major depressive disorder and implications for the discovery and development of investigational agents.

Le GH, McIntyre RS

Europe PMC2026
ArticlePsilocybin

Early response to psilocybin in adults with treatment-resistant depression as a predictor for antidepressant efficacy.

Doyle Z, Chisamore N, Kaczmarek ES +9

Europe PMC2026
ArticleKetamine

Durability of the benefit of vagus nerve stimulation in markedly treatment-resistant major depression: a RECOVER trial report.

Conway CR, Rush AJ, Aaronson ST +29

Europe PMC2026
ArticleKetamine

A systematic review of ketamine and esketamine-induced long-term potentiation and synaptic scaling: Do the molecular and synaptic plasticity effects inform dosing intervals?

Le GH, Wong S, Johnson DE +6

Europe PMC2026
ArticlePsilocybin

The effect of dextromethorphan on reward-related behaviors: A systematic review of preclinical and clinical evidence.

Teopiz KM, Le GH, Wong S +1

Europe PMC2026
ArticleKetamine

Effects of Intravenous Ketamine on Posttraumatic Stress Disorder (PTSD): A Systematic Review.

Yin L, Lu A, Le GH +13

Europe PMC2026
ArticlePsilocybin

Cognitive outcomes following psilocybin-assisted therapy in treatment-resistant depression: A post-hoc analysis of a randomized, waitlist-controlled trial.

Johnson DE, Meshkat S, Kaczmarek ES +11

Europe PMC2025
ArticleKetamine

The effects of ketamine and esketamine on functional outcomes in major depressive disorder and treatment-resistant depression: A systematic review.

Ji IS, Cheng MCH, Teopiz KM +8

Europe PMC2026
ArticleKetamine

A Systematic Review of the Effects of N-Methyl-D-Aspartate Receptor Antagonists on Pancreatic Islets.

Wong S, Le GH, Uhlig J +5

Europe PMC2026
ArticleKetamine

Ketamine, Psychedelics, and Psychotherapy: Reframing, Redefining, Renaming Treatment Models.

Swainson J, Brietzke E, Khullar A +2

Europe PMC2026
PreprintKetamine

Durability of the Benefit of Vagus Nerve Stimulation in Markedly Treatment-Resistant Major Depression: A RECOVER Trial Report

Conway CR, Rush AJ, Aaronson ST +29

Europe PMC2025
ArticleKetamine

Comment on Esketamine Treatment for Depression in Adults: A PRISMA Systematic Review and Meta-Analysis.

Canuso CM, Bossie C, Fu DJ +12

Europe PMC2025
ArticlePsilocybin

Temporal dynamics in neuroimaging as correlates of therapeutic response to psilocybin in major depressive disorder: A systematic review and critical appraisal.

Sabbah SG, Li S, Wong S +5

Europe PMC2026
ArticlePsychedelics

Safety and Efficacy of the NMDA-2b-Selective Negative Allosteric Modulator BI 1569912: A Phase Ib Randomized Trial in Major Depressive Disorder.

McIntyre RS, Sanacora G, Walling DP +7

Europe PMC2025
ArticlePsychedelics

Biased agonism in psychopharmacology: an opportunity to improve efficacy and safety of treatments.

Le GH, Wong S, Bargiota S +7

Europe PMC2025
ArticleKetamine

Ketamine and Esketamine for Late-Life Depression: A Systematic Review of Efficacy, Safety, and Tolerability.

Sukhdeo R, Tamura JK, Dri CE +1

Europe PMC2026
ArticleKetamine

Effectiveness of repeated Esketamine nasal spray administration on anhedonic symptoms in treatment-resistant bipolar and unipolar depression: A secondary analysis from the REAL-ESK study group.

d'Andrea G, Cavallotto C, Pettorruso M +25

Europe PMC2025
ArticleKetamine

A Global Population-Based Study on the Association Between Ketamine and Esketamine With Suicidality Using WHO VigiBase.

Kwan ATH, Lakhani M, Rosenblat JD +8

Europe PMC2025
ArticlePsilocybin

Examining mystical experiences as a predictor of psilocybin-assisted psychotherapy for treatment-resistant depression.

Brudner RM, Kaczmarek E, Blainey MG +9

Europe PMC2025
ArticleKetamine

Should glutamatergic modulators be considered preferential treatments for adults with major depressive disorder and a reported history of trauma? Conceptual and clinical implications.

Teopiz KM, Lo HKY, Lakhani M +11

Europe PMC2025
ArticlePsilocybin

Non-hallucinogenic psychedelics for mood and anxiety disorders: A systematic review.

Chen MJQ, Chen-Li D, Chisamore N +7

Europe PMC2025
ArticleKetamine

The Effects of Ketamine and Esketamine on Measures of Quality of Life in Major Depressive Disorder and Treatment-Resistant Depression: A Systematic Review.

Cheng MCH, Dri CE, Ballum H +5

Europe PMC2025
ArticlePsilocybin

Comparing Antidepressant Effects of Psilocybin-Assisted Psychotherapy in Individuals That Were Unmedicated at Initial Screening Versus Individuals Discontinuing Medications for Study Participation: Comparaison des effets antidépresseurs de la psychothérapie assistée par la psilocybine (PAP) chez les personnes non médicamentées à la sélection initiale et les personnes ayant arrêté les médicaments pour participer à l'étude.

Chisamore N, Kaczmarek ES, Doyle Z +8

Europe PMC2025
ArticlePsilocybin

Psilocybin-Assisted Psychotherapy for Treatment-Resistant Depression in Bipolar II Disorder.

Meshkat S, Kaczmarek E, Doyle Z +7

Europe PMC2025
ArticleKetamine

Improvements in functioning and workplace productivity with esketamine nasal spray versus quetiapine extended release in patients with treatment resistant depression: Findings from a 32-week randomised, open-label, rater-blinded phase IIIb study.

Vieta E, Ahmed N, Arango C +11

Europe PMC2025
ArticleKetamine

Demystifying the Antidepressant Mechanism of Action of Stinels, a Novel Class of Neuroplastogens: Positive Allosteric Modulators of the NMDA Receptor.

Donello JE, McIntyre RS, Pickel DB +1

Europe PMC2025
ArticleKetamine

Esketamine nasal spray versus quetiapine XR in adults with treatment-resistant depression: a secondary analysis of the ESCAPE-TRD randomized clinical trial.

McIntyre RS, Mattingly G, Godinov Y +7

Europe PMC2025
ArticleKetamine

Hepatic adverse events associated with ketamine and esketamine: A population-based disproportionality analysis.

Kwan ATH, Lakhani M, Teopiz KM +8

Europe PMC2025
ArticleKetamine

Functional Connectivity Between Glutamate Receptor Antagonism and Insulin Pathways: Implications for Modeling Mechanism of Action of Ketamine/Esketamine and Dextromethorphan in Depression Treatment.

Wong S, Le GH, Mansur RB +2

Europe PMC2025
ArticleKetamine

Glutamatergic Modulators for Major Depression from Theory to Clinical Use.

McIntyre RS, Jain R

Europe PMC2024
ArticleKetamine

A replication study using the World Health Organization pharmacovigilance database (VigiBase®) to evaluate whether an association between ketamine and esketamine and alcohol and substance misuse exists.

Kwan ATH, Rosenblat JD, Mansur RB +7

Europe PMC2024
ArticleKetamine

Safety and tolerability of esketamine nasal spray versus quetiapine extended release in patients with treatment resistant depression.

McIntyre RS, Bitter I, Buyze J +9

Europe PMC2024
ArticleKetamine

The association between ketamine and esketamine and suicidality: reports to the Food And Drug Administration Adverse Event Reporting System (FAERS).

McIntyre RS, Mansur RB, Rosenblat JD +2

Europe PMC2025
ArticlePsilocybin

Protocols and practices in psilocybin assisted psychotherapy for depression: A systematic review.

Chisamore N, Johnson D, Chen MJQ +6

Europe PMC2024
ArticleKetamine

The association between ketamine and esketamine with alcohol and substance misuse: Reports to the Food and Drug Administration adverse event reporting system (FAERS).

Kwan ATH, Rosenblat JD, Mansur RB +2

Europe PMC2024
ArticleKetamine

Number needed to treat (NNT) for ketamine and esketamine in adults with treatment-resistant depression: A systematic review and meta-analysis.

Calder CN, Kwan ATH, Teopiz KM +7

Europe PMC2024
ArticlePsilocybin

Spectral signatures of psilocybin, lysergic acid diethylamide (LSD) and ketamine in healthy volunteers and persons with major depressive disorder and treatment-resistant depression: A systematic review.

Le GH, Wong S, Badulescu S +11

Europe PMC2024
ArticleKetamine

Predicting non-response to ketamine for depression: An exploratory symptom-level analysis of real-world data among military veterans.

Miller EA, Afshar HT, Mishra J +2

Europe PMC2024
ArticleKetamine

Recent Advances in the Treatment of Treatment-Resistant Depression: A Narrative Review of Literature Published from 2018 to 2023.

Havlik JL, Wahid S, Teopiz KM +3

Europe PMC2024
ArticlePsilocybin

A comparison between psilocybin and esketamine in treatment-resistant depression using number needed to treat (NNT): A systematic review.

Wong S, Kwan ATH, Teopiz KM +8

Europe PMC2024
ArticleKetamine

The rapid antidepressant effectiveness of repeated dose of intravenous ketamine and intranasal esketamine: A post-hoc analysis of pooled real-world data.

d'Andrea G, Pettorruso M, Di Lorenzo G +16

Europe PMC2024
ArticleKetamine

Augmentation in depression: Esketamine, a new standard?

Rosenblat JD, McIntyre RS

Europe PMC2023
ArticleLSD

The effects of Lysergic Acid Diethylamide (LSD) on the Positive Valence Systems: A Research Domain Criteria (RDoC)-Informed Systematic Review.

Pouyan N, Younesi Sisi F, Kargar A +3

Europe PMC2023
ArticlePsilocybin

Psilocybin-assisted therapy for depression: A systematic review and meta-analysis.

Haikazian S, Chen-Li DCJ, Johnson DE +6

Europe PMC2023
ArticleKetamine

Treatment-resistant depression: definition, prevalence, detection, management, and investigational interventions.

McIntyre RS, Alsuwaidan M, Baune BT +24

Europe PMC2023
ArticleKetamine

Exploring the potential of a bridge therapy: Synergistic approach integrating intravenous ketamine and intranasal esketamine for treatment-resistant depression.

d'Andrea G, Pettorruso M, Rhee TG +3

Europe PMC2023
ArticleKetamine

Predicting outcome with Intranasal Esketamine treatment: A machine-learning, three-month study in Treatment-Resistant Depression (ESK-LEARNING).

Pettorruso M, Guidotti R, d'Andrea G +25

Europe PMC2023
ArticleKetamine

Investigating the Effectiveness and Tolerability of Intranasal Esketamine Among Older Adults With Treatment-Resistant Depression (TRD): A Post-hoc Analysis from the REAL-ESK Study Group.

d'Andrea G, Chiappini S, McIntyre RS +12

Europe PMC2023
ArticlePsilocybin

Is the psychedelic experience an essential aspect of the therapeutic effect of serotonergic psychedelics? Conceptual, discovery, development and implementation implications for psilocybin and related agents.

McIntyre RS

Europe PMC2023
ArticlePsilocybin

Serotonin 5-HT<sub>2B</sub> receptor agonism and valvular heart disease: implications for the development of psilocybin and related agents.

McIntyre RS

Europe PMC2023
ArticleKetamine

The Role of Ketamine in the Treatment of Bipolar Depression: A Scoping Review.

Jawad MY, Qasim S, Ni M +8

Europe PMC2023
ArticlePsilocybin

Antidepressant Effects of Psilocybin in the Absence of Psychedelic Effects.

Rosenblat JD, Leon-Carlyle M, Ali S +2

Europe PMC2023
ArticleKetamine

Rethinking ketamine and esketamine action: Are they antidepressants with mood-stabilizing properties?

d'Andrea G, Pettorruso M, Lorenzo GD +3

Europe PMC2023
ArticleKetamine

Treating bipolar depression with esketamine: Safety and effectiveness data from a naturalistic multicentric study on esketamine in bipolar versus unipolar treatment-resistant depression.

Martinotti G, Dell'Osso B, Di Lorenzo G +23

Europe PMC2023
ArticleKetamine

A Phase II, Open-Label Clinical Trial of Intranasal Ketamine for Depression in Patients with Cancer Receiving Palliative Care (INKeD-PC Study).

Rosenblat JD, deVries FE, Doyle Z +9

Europe PMC2023
ArticlePsilocybin

A Critical Appraisal of Evidence on the Efficacy and Safety of Serotonergic Psychedelic Drugs as Emerging Antidepressants: Mind the Evidence Gap.

Ledwos N, Rosenblat JD, Blumberger DM +4

Europe PMC2022
ArticlePsilocybin

A Research Domain Criteria (RDoC)-Guided Dashboard to Review Psilocybin Target Domains: A Systematic Review.

Pouyan N, Halvaei Khankahdani Z, Younesi Sisi F +14

Europe PMC2022
ArticlePsilocybin

The Canadian Network for Mood and Anxiety Treatments (CANMAT) Task Force Report: Serotonergic Psychedelic Treatments for Major Depressive Disorder.

Rosenblat JD, Husain MI, Lee Y +18

Europe PMC2023
ArticlePsilocybin

Molecular Mechanisms of Psilocybin and Implications for the Treatment of Depression.

Ling S, Ceban F, Lui LMW +12

Europe PMC2022
ArticlePsilocybin

Registered clinical studies investigating psychedelic drugs for psychiatric disorders.

Siegel AN, Meshkat S, Benitah K +6

Europe PMC2021
ArticlePsilocybin

The emerging role of psilocybin and MDMA in the treatment of mental illness.

Gill H, Gill B, Chen-Li D +11

Europe PMC2020