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Roger S McIntyre

University of Toronto, University Health Network

138 papers in the library · 4,098 citations · publishing 0-2026

Papers

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

Journal of Affective Disorders April 1, 2025 Angela T H Kwan, Moiz Lakhani, Kayla M Teopiz et al. 11 citations

To determine whether there is disproportionate reporting of hepatobiliary disorders in the United States (US) FDA Adverse Event Reporting System (FAERS) for individuals prescribed ketamine or esketamine. We identified Medical Dictionary for Regulatory Activities (MedDRA) terms in the FAERS related to hepatobiliary disorders. Formulations of ketamine and esketamine were evaluated for the...

DOI: 10.1016/j.jad.2025.01.054 (opens in new tab) Full text (opens in new tab) Esketamine Drug-induced liver injury Hepatobiliary disorders Hepatotoxicity +9

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

The Canadian Journal of Psychiatry March 25, 2025 Noah Chisamore, Erica Kaczmarek, Zoe Doyle et al. 1 citation

Objective: To compare changes in depression, anxiety, and suicidality symptoms after a single 25 mg oral dose of psilocybin between treatment-resistant depression participants not on antidepressants at screening to participants that discontinued antidepressant medications leading up to receiving psilocybin-assisted psychotherapy (PAP). Methods: Participants (n = 27) received at least one 25 mg...

DOI: 10.1177/07067437251328316 (opens in new tab) Treatment-resistant depression Depressive disorders Mood disorders Psilocybin-assisted psychotherapy +4

Examining the impact of comorbid posttraumatic stress disorder on ketamine's real-world effectiveness in treatment-resistant depression.

European Neuropsychopharmacology February 1, 2025 Danica E. Johnson, Nelson B Rodrigues, Sydney Weisz et al.

Depression with comorbid posttraumatic stress disorder (PTSD) is associated with more severe symptoms and a reduced response to traditional treatments. Although ketamine shows promise as a rapid-acting antidepressant for treatment-resistant depression (TRD), its effectiveness in patients with comorbid PTSD remains underexplored. Therefore, we conducted a retrospective analysis of 134 patients...

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

Pharmaceuticals January 24, 2025 John E Donello, Roger S McIntyre, Donald B Pickel et al. 14 citations

Plastogens are a class of therapeutics that function by rapidly promoting changes in neuroplasticity. A notable example, ketamine, is receiving great attention due to its combined rapid and long-term antidepressant effects. Ketamine is an N-methyl-D-aspartate receptor (NMDAR) antagonist, and, in addition to its therapeutic activity, it is associated with psychotomimetic and dissociative side...

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

CNS Spectrums January 17, 2025 Roger S McIntyre, Gregory W Mattingly, Yordan Godinov et al. 9 citations

Esketamine nasal spray (ESK) is approved in combination with an oral antidepressant (OAD) for the treatment of adults with treatment-resistant depression (TRD); however, direct comparisons with atypical antipsychotics for TRD are limited. This secondary analysis of the ESCAPE-TRD study compared rates of remission and response, and improvements in depressive symptoms over time, between ESK and...

Psychedelics for the Treatment of Psychiatric Disorders: Interpreting and Translating Available Evidence and Guidance for Future Research.

American Journal of Psychiatry 2025 Roger S McIntyre, Angela T H Kwan, Rodrigo B. Mansur et al. 23 citations

During the past decade, there has been extraordinary public, media, and medical research interest in psychedelics as promising therapeutics for difficult-to-treat psychiatric disorders. Short-term controlled trial data suggest that certain psychedelics are effective and safe in the treatment of major depressive disorder, treatment-resistant depression, and posttraumatic stress disorder....

Effect of intravenous ketamine on suicidality in adults with treatment-resistant depression: A real world effectiveness study.

Psychiatry Research 2025 David C J Chen-Li, Rodrigo B. Mansur, Joshua D. Di Vincenzo et al. 6 citations

Suicidal ideation is a significant symptom associated with mood disorders. Ketamine is an emerging treatment with rapid and robust antidepressant and antisuicidal effects observed in clinical trial populations. Herein we assessed the real-world effectiveness of ketamine in ameliorating suicidality. A retroactive chart analysis of 96 adult TRD patients that received treatment in a private...

DOI: 10.1016/j.psychres.2024.116282 (opens in new tab) Full text (opens in new tab) Antisuicidal effects Suicidal ideation Ketamine therapy Suicide prevention +2

Effects of ketamine on metabolic parameters in depressive disorders: A systematic review.

Journal of Affective Disorders December 15, 2024 Sabrina Wong, Gia Han Le, Rodrigo B. Mansur et al. 3 citations

Persons with Major Depressive Disorder (MDD), notably treatment-resistant depression (TRD), are differentially affected by type 2 diabetes mellitus and associated morbidity. Ketamine is highly efficacious in the treatment of adults living with MDD, notably TRD. Herein, we sought to determine the effect of ketamine on metabolic parameters in animal stress paradigms and human studies. We...

DOI: 10.1016/j.jad.2024.08.208 (opens in new tab) Full text (opens in new tab) Glucose homeostasis Insulin Treatment-resistant depression trd Ketamine therapy +4

Ketamine for the Treatment of Psychiatric Disorders: A Systematic Review and Meta-Analysis.

CNS Spectrums November 20, 2024 Angela T H Kwan, Moiz Lakhani, Gurkaran Singh et al. 4 citations

Inadequate response to first- and second-line pharmacological treatments for psychiatric disorders is commonly observed. Ketamine has demonstrated efficacy in treating adults with treatment-resistant depression (TRD), with additional off-label benefits reported for various psychiatric disorders. Herein, we performed a systematic review and meta-analysis to examine the therapeutic applications...

DOI: 10.1017/S1092852924000580 (opens in new tab) Full text (opens in new tab) Anxiety disorders Eating disorders Schizophrenia Substance/alcohol use disorders +5

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

Psychedelic Medicine November 18, 2024 Shakila Meshkat, Erica Kaczmarek, Zoe Doyle et al. 8 citations

Background: Bipolar II disorder (BD-II) is often associated with chronic and treatment resistant major depressive episodes. Psilocybin has shown promise for its rapid-acting antidepressant effects, though its impact on bipolar depression remains unexplored. In the present subgroup analysis of an already published trial on treatment-resistant depression (TRD), we aimed to preliminarily evaluate...

Glutamatergic Modulators for Major Depression from Theory to Clinical Use.

CNS Drugs November 1, 2024 Roger S McIntyre, Rakesh Jain 58 citations

Major depressive disorder (MDD) is a chronic, burdensome, highly prevalent disease that is characterized by depressed mood and anhedonia. MDD is especially burdensome as approved monoamine antidepressant treatments have weeks-long delays before clinical benefit and low remission rates. In the past 2 decades, a promising target emerged to improve patient outcomes in depression treatment:...

DOI: 10.1007/s40263-024-01114-y (opens in new tab) Full text (opens in new tab) Depression treatment Mental health Antidepressants Brain chemistry

Efficacy of esketamine for perinatal depression: a systematic review and meta-analysis.

CNS Spectrums October 31, 2024 Sabrina Wong, Gia Han Le, Angela T H Kwan et al. 10 citations

Postpartum depression (PPD), now referred to as perinatal depression, is a prevalent and debilitating mood disorder that reduces health-related quality of life (HRQoL) and psychosocial functioning. Esketamine, which is efficacious in adults with treatment-resistant depression and individuals with depression and suicidality, is also analgesic in pain management during childbirth labour. Herein,...

DOI: 10.1017/S1092852924000452 (opens in new tab) Full text (opens in new tab) Spravato Mdd prevention Perinatal depression Postpartum depression ppd +4

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.

Journal of Affective Disorders October 15, 2024 Angela T H Kwan, Joshua D. Rosenblat, Rodrigo B. Mansur et al. 13 citations

Ketamine and esketamine are increasingly prescribed in the treatment of resistant mood disorders and persons at risk of suicide. Ketamine is a drug of misuse with increasing non-therapeutic use in the general population. Herein, our aim was to determine whether ketamine and/or esketamine are disproportionately associated with reports of substance and/or alcohol misuse. Replicating a similar...

The Association Between Dextromethorphan/Bupropion with Alcohol and Substance Misuse: Reports to the Food and Drug Administration Adverse Event Reporting System (FAERS)

CNS Spectrums October 1, 2024 Angela T H Kwan, Roger S McIntyre

AbstractObjectiveDextromethorphan/bupropion (DXM/BUP) received Food and Drug Administration (FDA) approval for the treatment of adults with major depressive disorder (MDD) in August 2022. This combination is not known to have abuse liability and is not currently scheduled by the Drug Enforcement Administration (DEA). Notwithstanding, dextromethorphan is a drug of abuse. Herein, we sought to...

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

Journal of Affective Disorders September 1, 2024 Angela T H Kwan, Joshua D. Rosenblat, Rodrigo B. Mansur et al. 8 citations

Ketamine and esketamine have been proven to be effective in treating adults with treatment resistant depression (TRD). Preliminary evidence indicates that, when combined with behavioral and psychological interventions, both agents may offer benefits for individuals with substance use disorder (SUD) and alcohol use disorder (AUD). Notwithstanding, concerns have been raised as to whether either...

DOI: 10.1016/j.jad.2024.05.116 (opens in new tab) Full text (opens in new tab) Diversion Ketamine abuse liability Treatment-resistant depression trd Adverse event reporting +2

Non-improvement predicts subsequent non-response to repeated-dose intravenous ketamine for depression: a re-analysis of a 2-week open-label study in patients with unipolar and bipolar depression.

Translational Psychiatry August 6, 2024 Chengyu Wang, Xiaofeng Lan, Weijian Liu et al. 6 citations

There is insufficient evidence to guide dose and frequency optimization with repeated-dose ketamine for depression. This study assessed the value of symptomatic non-improvement after the first few ketamine infusions as a predictor of overall non-response in depression for early decision-making to discontinue treatment. A total of 135 individuals with major depressive disorder or bipolar...

DOI: 10.1038/s41398-024-03027-2 (opens in new tab) Full text (opens in new tab) Depression treatment Ketamine therapy Mental health research Treatment response prediction

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

European Neuropsychopharmacology August 1, 2024 Roger S McIntyre, Istvan Bitter, Jozefien Buyze et al. 30 citations

In ESCAPE-TRD (NCT04338321), esketamine nasal spray (NS) significantly increased the probability of remission at Week 8, and of being relapse-free through Week 32 after remission at Week 8, versus quetiapine extended release (XR) in patients with treatment resistant depression (TRD). Here, we explore the time course, burden and consequences of treatment emergent adverse events (TEAEs) in the...

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

Journal of Psychiatric Research August 1, 2024 Noah Chisamore, Danica E. Johnson, Margery J.q. Chen et al. 21 citations

Psilocybin-assisted psychotherapy (PAP) is a promising treatment option for depression, with randomized controlled trials (RCTs) providing preliminary support for its safety and efficacy. However, there is a lack of consistency across existing treatment protocols and psychotherapeutic approaches. The objective of this review is to summarize and compare current psychotherapy methods of PAP in...

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

Journal of Affective Disorders July 1, 2024 Cameron N Calder, Angela T H Kwan, Kayla M Teopiz et al. 31 citations

Ketamine has been established as efficacious in adults living with Treatment-resistant Depression (TRD). Toward providing a quantifiable estimate of the clinical meaningfulness of the therapeutic benefit of ketamine, herein, we conduct a systematic review that aims to report the Number Needed to Treat (NNT) and the Number Needed to Harm (NNH). This systematic review searched Embase,...

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

Expert Opinion on Drug Safety June 21, 2024 Roger S McIntyre, Rodrigo B. Mansur, Joshua D. Rosenblat et al. 7 citations

Replicated evidence indicates that ketamine and esketamine reduce measures of suicidality in persons with treatment-resistant depression (TRD). It remains uncertain whether individuals experience worsening of preexisting suicidality with either agent. The Food and Drug Administration Adverse Event Reporting System (FAERS) database was searched from 1970 and 2019 to 30 September 2023 for reports...

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.

Journal of Affective Disorders June 15, 2024 Gia Han Le, Sabrina Wong, Sebastian Badulescu et al. 25 citations

Electrophysiologic measures provide an opportunity to inform mechanistic models and possibly biomarker prediction of response. Serotonergic psychedelics (SPs) (i.e., psilocybin, lysergic acid diethylamide (LSD)) and ketamine represent new investigational and established treatments in mood disorders respectively. There is a need to better characterize the mechanism of action of these agents. We...

DOI: 10.1016/j.jad.2024.03.165 (opens in new tab) Full text (opens in new tab) Electroencephalography Glutamatergic dissociatives Magnetoencephalography Serotinergic psychedelics +8

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

Psychiatry Research May 1, 2024 Eric A. Miller, Houtan Totonchi Afshar, Jyoti Mishra et al. 12 citations

Ketamine helps some patients with treatment resistant depression (TRD), but reliable methods for predicting which patients will, or will not, respond to treatment are lacking. Herein, we aim to inform prediction models of non-response to ketamine/esketamine in adults with TRD. This is a retrospective analysis of PHQ-9 item response data from 120 patients with TRD who received repeated doses of...

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

Current Psychiatry Reports April 1, 2024 John L. Havlik, Syed Wahid, Kayla M Teopiz et al. 30 citations

Purpose of Review We review recent advances in the treatment of treatment-resistant depression (TRD), a disorder with very limited treatment options until recently. We examine advances in psychotherapeutic, psychopharmacologic, and interventional psychiatry approaches to treatment of TRD. We also highlight various definitions of TRD in recent scientific literature. Recent Findings Recent...

DOI: 10.1007/s11920-024-01494-4 (opens in new tab) Full text (opens in new tab) Esketamine Treatment-resistant depression trd Electroconvulsive therapy ect Pharmacotherapy

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

Journal of Affective Disorders April 1, 2024 Sabrina Wong, Angela T H Kwan, Kayla M Teopiz et al. 19 citations

Inadequate outcomes with monoamine-based treatments in depressive disorders are common and provide the impetus for mechanistically-novel treatments. Esketamine is a proven treatment recently approved for adults with Treatment-Resistant Depression (TRD) while psilocybin is an investigational treatment. Translation of the clinical meaningfulness for these foregoing agents in adults with TRD is...

Brain-derived neurotrophic factor Val66Met and CYP2B6 polymorphisms as predictors for ketamine effectiveness in patients with treatment-resistant depression.

Journal of Psychopharmacology April 1, 2024 Nelson B Rodrigues, David C J Chen-Li, Joshua D. Di Vincenzo et al. 12 citations

Converging lines of evidence indicate that ketamine is a rapid antidepressant for individuals with treatment-resistant depression. Hitherto, no reliable a priori predictors of ketamine response have been reported. Pharmacogenetic biomarkers have yielded mixed results regarding potential candidate genes associated with ketamine's biochemistry as reliable predictors of response. No studies have...