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Treatment-Resistant Depression: Approaches to Treatment
Abstract
Approximately 30% of people treated for a major depressive episode will not achieve remission after two or more treatment trials of first-line antidepressants and are considered to have treatment-resistant depression (TRD). Because the odds of remission decrease with every subsequent medication trial, it is important for clinicians to understand the characteristics and risk factors for TRD, subtypes of major depressive disorder that are more likely to be less responsive to first-line anti-depressants, and the available treatment options. In the current article, we review the approved treatments for TRD, including esketamine, and the evidence for psilocybin and pramipexole. Although limited in specificity, guidelines to help prescribers identify person-centered treatments for TRD are available. [ Journal of Psychosocial Nursing and Mental Health Services, 59 (9), 7–11.]
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“Furthermore, many patients will require multiple medication trials and may take months to experience any symptomatic improvement [36].”
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“Recently, rapid progress has been made in the study of depression pathogenesis and the identification of specific drug treatment targets [134].”
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“For STAI-estimated uneasiness side effects, a similar outcome was observed [18-20].”
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“The odds of remission decrease with every subsequent line of treatment.(5) Additionally, the time to response to existing antidepressants is usually long (weeks to months), thereby necessitating long-term treatment to achieve remission.”
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Arıkan, M. K., İlhan, R., Orhan, Ö., Esmeray, M. T., Turan, Ş., Gıca, Ş., Bakay, H., Pogarell, O. M., Tarhan, N., & Metin, B. (2024) · The World Journal of Biological Psychiatry · doi:10.1080/15622975.2024.2321554 · Cited by 30
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Huang, X., Wang, B., Yang, J., Lian, Y., Yu, H.-Z., & Wang, Y. (2023) · Brain Behavior & Immunity - Health · doi:10.1016/j.bbih.2023.100641 · Cited by 23
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Roberts, B., Cooper, Z., Lu, S. Y., Stanley, S. H., Majda, B. T., Collins, K. R. L., Gilkes, L., Rodger, J., Akkari, P. A., & Hood, S. D. (2023) · Frontiers in Pharmacology · doi:10.3389/fphar.2023.1267294 · Cited by 22
“Furthermore, this same third of people treated for depression who do not show full remission following two or more treatment trials of first-line antidepressants may develop a persistent depressive disorder (Kverno and Mangano, 2021).”
BackgroundA focus on Rho/ROCK signaling pathway: An emerging therapeutic target in depression
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“Major depressive disorder (MDD) is the most common psychiatric disorder, and even though MDD receives standardized treatment, 30% of MDD patients are still clinically ineffective or have poor outcomes [1].”
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BackgroundTseng, V. W.-S., Tharp, J. A., Reiter, J. E., Ferrer, W., Hong, D. S., Doraiswamy, P. M., Nickels, S., Schilsky, R. L., Allen, J., Anderson, M. A., et al. (2023) · Psychiatry Research · doi:10.1016/j.psychres.2023.115702 · Cited by 12
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“This finding is consistent with prior international investigations, which have indicated a considerable variation in TRD prevalence, ranging from 12 to 55% [30].”
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“Although several therapeutic interventions are accessible for its management, attaining remission has proven challenging (Kverno and Mangano, 2021).”
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“Until recently, advances in antidepressant therapy had limited success in treating individuals with TRD [18,19].”
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“It is widely acknowledged that TRD is a difficult condition to treat (6, 11, 13, 31).”
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“Despite receiving adequate antidepressant treatments, approximately 30% of patients exhibit treatment-resistant depression (TRD), wherein clinical symptoms remain refractory to conventional interventions [2].”
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“Despite extensive research, significant gaps remain in understanding its etiology and underlying molecular mechanisms, hindering the development of rapid and effective treatments [5].”
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“TRD affects up to 30 % of people treated for a major depressive episode, in whom therapeutic success is not achieved after two or more attempts at antidepressant drug therapy [45].”
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Quantitative evaluation of multiple treatment regimens for treatment-resistant depression
Feng, Y., Lv, Y.-H., Yang, J., Xu, L., Chen, J.-C., Huang, J.-H., Ren, J.-Y., Zheng, Q., & Li, L.-J. (2025) · International Journal of Neuropsychopharmacology · doi:10.1093/ijnp/pyaf007 · Cited by 4
“29 Quetiapine, another atypical antipsychotic, blocks dopamine D2 and serotonin 5-HT2 receptors and has affinity for other serotonin, norepinephrine, and histamine receptors, which can alleviate depressive symptoms and is used in the treatment of TRD. 30 This study shows that the efficacy of quetiapine combined with S…”
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“…vary (Belmaker & Agam, 2008), more than half of MDD may still experience a relapse of depressive symptoms 3 – 12 months after initial drug treatment (Kverno & Mangano, 2021; Wang et al., 2022), and some patients may undergo multiple episodes of depression years after their initial treatment,…”
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“Options for depression treat-ment are limited, and patients are dealing with poor or unsat-isfactory drug responses [15].”
BackgroundYin, X., Chen, S., Ju, X., & Hu, X.-W. (2023) · Frontiers in Psychiatry · doi:10.3389/fpsyt.2023.1170890 · Cited by 4
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“These phenomena have led to a new diagnosable condition, treatment-resistant depression, which occurs in 30% of patients treated for major depressive disorder, and is defined as a failure to achieve disease remission after treatment with at least two first-line antidepressants [35].”
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The Therapeutic Potential of Psychedelics for Treatment-resistant Depression
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Psilocybin-assisted psychotherapy in adults with depression – A literature review
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“However, Western medicine approaches for treating depression are limited in clinical practice due to side effects such as gastrointestinal reactions, sleepiness, and suicidal tendencies (Kverno & Mangano, 2021).”
BackgroundCrișan, C., Stretea, R., Bonea, M., Fîntînari, V., Țața, I.-M., Stan, A., Micluția, I., Cherecheș, R., & Milhem, Z. (2024) · Journal of Personalized Medicine · doi:10.3390/jpm14050519 · Cited by 3
“In severe cases, treatments like electroconvulsive therapy or transcranial magnetic stimulations may be considered [17–19].”
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“Furthermore, many patients will require multiple medication trials and may take months to experience any symptomatic improvement [36].”
Mood food: antidepressant effects of culinary spices
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“Although different treatment options are available, about 30 – 50% of patients do not respond [3], and some of them develop treatment resistant depression, overall indicating the urgent need to identify novel targets for interventions.”
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“Ket, a fast-acting antidepressant, has been widely studied and recognized for its potential in the treatment of mental disorders [9,42].”
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“…approach relies on the use of selective serotonin reuptake inhibitors (SSRIs), although notably, around 30 % of patients treated with SSRIs exhibit resistance to this first-line treatment (Papakostas and Fava, 2010; Kverno and Mangano, 2021; Borb ´ ely et al., 2022; Nu ˜ nez et al., 2022).”
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Psychiatric and legal considerations for ketamine treatment within prison settings
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“Research has also indicated that approximately 30% of patients treated for a major depressive episode did not achieve remission after receiving two or more first-line antidepressant treatments (Kverno and Mangano, 2021).”
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“Approximately 30% of individuals diagnosed with major depressive episodes will experience TRD [5].”
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“Approximately 20 – 30% of patients with MDD develop TRD, typically defined as the failure to achieve clinical response following at least two adequate antidepressant trials [1,2].”
InfluentialVilela-Filho, O., Bannach, M., Lino-Filho, A. M., Hamani, C., Nuttin, B., Hariz, M., Schulder, M., Greenberg, B. D., Cosgrove, R., de Oliveira-Souza, R., et al. (2026) · Journal of Neurology Neurosurgery & Psychiatry · doi:10.1136/jnnp-2025-337800 · Cited by 1
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“Critically, approximately 30% of patients develop TRD with inadequate conventional antidepressant response [7], necessitating urgent development of rapid-acting alternatives like ketamine, whose NMDA receptor antagonism enables rapid synaptic remodeling and significant clinical potential for TRD…”
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“Up to 35% of patients fail to respond to two trials of first-line treatments and are considered to have treatment-resistant depression (TRD) [ 4 ].”
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The role of psilocybin in depressive disorders
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“Additionally, the prevalence of treatment-resistant depression is noted to be 10%–30% 12,58 .”
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We Are Their Hope: Addressing Mental Health Barriers Through Advocacy.
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“What is more, in some cases, they are unfortunately insufficient for the management of illnesses [24,25].”
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Metadata
- Authors
- Kverno, K. S., & Mangano, E.
- Venue
- Journal of Psychosocial Nursing and Mental Health Services
- Publisher
- SLACK, Inc.
- Published
- 2021-09
- Volume
- 59
- Issue
- 9
- Pages
- 7-11
- ISSN
- 0279-3695 (ISSN-L)
- 1938-2413
- OpenAlex
- W3196802696
- Cited by
- 121
- References
- 0
- Citations by year
- 2026: 13 · 2025: 30 · 2024: 36 · 2023: 32 · 2022: 9
- FWCI
- 2.44
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Psychosocial Nursing and Mental Health Services (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Pharmacology (medical) › Treatment of Major Depression
- Health Sciences › Medicine › Psychiatry and Mental health › Electroconvulsive Therapy Studies
- Health Sciences › Medicine › Psychiatry and Mental health › Mental Health Treatment and Access
- Keywords
- treatment-resistant depression, major depressive disorder, antidepressant treatment, esketamine, psilocybin, pramipexole, depression subtypes, depression remission
- MeSH terms
- Antidepressive Agents, Depression, Major Depressive Disorder, Drug Therapy, Combination, Humans, Depressive Disorder, Treatment-Resistant
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