Year : 2017  |  Volume : 59  |  Issue : 3  |  Page : 259--261

A possible role for ketamine in suicide prevention in emergency and mainstream psychiatry

TS Sathyanarayana Rao1, Chittaranjan Andrade2,  
1 Department of Psychiatry, JSS Medical College Hospital, JSS University, Mysore, Karnataka, India
2 Department of Psychopharmacology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India

Correspondence Address:
Chittaranjan Andrade
Department of Psychopharmacology, National Institute of Mental Health and Neurosciences, Bengaluru - 560 029, Karnataka

How to cite this article:
Sathyanarayana Rao T S, Andrade C. A possible role for ketamine in suicide prevention in emergency and mainstream psychiatry.Indian J Psychiatry 2017;59:259-261

How to cite this URL:
Sathyanarayana Rao T S, Andrade C. A possible role for ketamine in suicide prevention in emergency and mainstream psychiatry. Indian J Psychiatry [serial online] 2017 [cited 2020 Sep 26 ];59:259-261
Available from:

Full Text

World Suicide Prevention Day was observed on September 10, 2017. It is universally acknowledged that suicide is an important public health problem and that the problem is growing.[1],[2],[3] Interventions that address suicide are psychosocial and psychopharmacological in nature.[4],[5],[6],[7],[8] Psychosocial interventions include preventative and therapeutic measures, including screening, psychoeducation, crisis intervention, nonspecific supportive therapy, and specific psychotherapies. Psychopharmacological interventions include antidepressant, antianxiety, and other treatments, usually targeting the primary psychiatric diagnosis and the general anxiety and agitation that may be present. Electroconvulsive therapy, which has a strong antisuicidal effect,[9] may be administered to severely depressed and suicidal patients.

Among the psychopharmacological interventions, antidepressant drugs, which reduce depression and thereby also the suicidal ideation, may rarely induce agitation and suicidal ideation as an adverse effect;[10] this is more likely in pediatric subjects and young adults,[11],[12] and in all age groups, at the time of antidepressant initiation and antidepressant dose uptitration.[10] Certain psychotropic drugs appear to have long-term protective effects against suicide risk; these include lithium and clozapine.[8],[13]

 Conventional Approach to Management

The presence of suicidal ideation with strong suicidal intent is considered to be a clinical emergency. Suicidal patients are usually managed as inpatients because self-harm is difficult and unlikely in a supportive, therapeutic, and controlled hospital environment. However, inpatient care requires patients to temporarily leave their ongoing domestic and professional responsibilities. In India, hospitalized patients require one or more caregiver to stay with the patient in the hospital ward, and so the caregivers will also need to temporarily leave their ongoing domestic and professional responsibilities. Furthermore, financial arrangements need to be made for the inpatient care. All of these may not be immediately possible, or may not be possible at all, in many cases.

What is the alternative? The most usual approach is to send the patients back into their stressful environment with a prescription for an antidepressant, and perhaps a benzodiazepine for immediate relief from symptoms of anxiety and agitation. A therapeutic contract may be made with the patients so that, in case of distress, the patients will contact the psychiatric team rather than attempt self-harm. Family members are asked to dispense the medicines themselves and to keep a watch on the patient lest an incident of self-harm occurs.

 Ketamine as an Approach to the Management of Suicide Risk

Can anything more be done? Yes, if the recent research on the antidepressant and antisuicidal action of ketamine is considered. There is a growing body of evidence that indicates that, in subanesthetic doses, ketamine has rapid antidepressant [14],[15],[16],[17],[18] and antisuicidal action. In fact, suicide risk is one context within a major depressive episode in which the use of ketamine has been specifically suggested.[15] Small studies conducted in emergency department settings have demonstrated that the antisuicidal effect of ketamine may even be apparent within 40 min of treatment.[19],[20]

 Findings from Meta-Analysis

Many studies have assessed the antisuicidal effect of ketamine. These studies were examined in a systematic review and meta-analysis by Bartoli et al.[21] These authors [21] searched electronic databases and other sources and identified five clinical trials (pooled n = 99) that assessed outcomes at or within 4 h after a single session of intravenous (iv) ketamine in patients with current suicidal ideation. Two of these trials were conducted in emergency room settings. Two trials administered ketamine as an iv bolus (0.2 mg/kg; n = 63) and the other three administered ketamine as an iv infusion (0.5 mg/kg; n = 36). In summary, a single session of iv ketamine was found to be associated with a substantial reduction in suicidal ideation in patients with current suicidal ideation. The effect was seen within 4 h of treatment, and the effect size was large [Box].[INLINE:1]

In this meta-analysis, the number of studies and the pooled sample size were both small for the main analysis in general and the subgroup and sensitivity analyses in particular. Furthermore, the meta-analysis examined single group pre- versus post-treatment outcomes rather than change scores in ketamine versus control groups (because of the study design of the included trials). The results of this meta-analysis should, therefore, be considered tentative rather than conclusive.

 Treatment Issues

It is unlikely that ketamine has a specific antisuicidal effect over and above its antidepressant effect; rather, the reduction in suicidality probably occurs as a consequence of the reduction in the severity of the depression in general.[22] Therefore, ketamine may not have an antisuicidal action in patients in whom it does not have an antidepressant effect. However, no treatment in medicine comes with an assurance of efficacy in all patients.

Whereas open studies and randomized controlled trials of single and repeated doses of iv ketamine have demonstrated that ketamine attenuates measures of suicidality even in patients with treatment-refractory depression,[20],[22],[23],[24] the benefits have been observed to wear off within days to a week, along with the wearing off of the other antidepressant benefits of ketamine.[24] In some patients, antisuicidal benefits may persist for as long as 10 days.[19] Repeated dosing with ketamine may then be necessary to maintain antisuicidal action if the risk of suicide reemerges after initial attenuation with ketamine. The brief efficacy is not necessarily a disadvantage because the time thus bought could allow the implementation of other psychopharmacological and psychosocial interventions, as appropriate.[15]

Most of the research on the use of ketamine as an antidepressant has focused on iv administration of the drug. However, the drug can be administered by oral, sublingual, transmucosal, intranasal, subcutaneous, and oral routes, as well.[17] Administration through a nebulizer is also feasible. Research is necessary to examine the antidepressant and antisuicidal efficacy of oral and subcutaneous administration because, from a clinical perspective, these could be the safest and most convenient methods of administration in routine clinical practice.[17]

Suicidal behavior does not occur only in the context of a major depressive episode. It may also occur in patients with personality disorder, those exposed to sudden, serious stress, and other conditions/situations. Research is necessary to determine whether subanesthetic dosing with ketamine has antisuicidal benefits in patients with diagnoses beyond major depressive disorder or bipolar depression.

Finally, should subanesthetic dosing with ketamine enter mainstream psychiatry as an intervention for the emergency management of depression and suicidality, and for the management of refractory depression, then psychiatrists and postgraduate students in psychiatry will need to receive training and privileging for the administration of ketamine, much as they do with regard to ECT. At the moment, although much is known, much remains to be established.[25]


1Vijayakumar L. Indian research on suicide. Indian J Psychiatry 2010;52:S291-6.
2Radhakrishnan R, Andrade C. Suicide: An Indian perspective. Indian J Psychiatry 2012;54:304-19.
3Ponnudurai R. Suicide in India – Changing trends and challenges ahead. Indian J Psychiatry 2015;57:348-54.
4Vijaykumar L. Suicide and its prevention: The urgent need in India. Indian J Psychiatry 2007;49:81-4.
5Vijayakumar L, Umamaheswari C, Shujaath Ali ZS, Devaraj P, Kesavan K. Intervention for suicide attempters: A randomized controlled study. Indian J Psychiatry 2011;53:244-8.
6Ramadas S, Kuttichira P, John CJ, Isaac M, Kallivayalil RA, Sharma I, et al. Position statement and guideline on media coverage of suicide. Indian J Psychiatry 2014;56:107-10.
7Meerwijk EL, Parekh A, Oquendo MA, Allen IE, Franck LS, Lee KA, et al. Direct versus indirect psychosocial and behavioural interventions to prevent suicide and suicide attempts: A systematic review and meta-analysis. Lancet Psychiatry 2016;3:544-54.
8Zalsman G, Hawton K, Wasserman D, van Heeringen K, Arensman E, Sarchiapone M, et al. Suicide prevention strategies revisited: 10-year systematic review. Lancet Psychiatry 2016;3:646-59.
9Fink M, Kellner CH, McCall WV. The role of ECT in suicide prevention. J ECT 2014;30:5-9.
10Reeves RR, Ladner ME. Antidepressant-induced suicidality: An update. CNS Neurosci Ther 2010;16:227-34.
11Andrade C, Bhakta SG, Singh NM. Controversy revisited: Selective serotonin reuptake inhibitors in paediatric depression. World J Biol Psychiatry 2006;7:251-60.
12Sharma T, Guski LS, Freund N, Gøtzsche PC. Suicidality and aggression during antidepressant treatment: Systematic review and meta-analyses based on clinical study reports. BMJ 2016;352:i65.
13Cipriani A, Hawton K, Stockton S, Geddes JR. Lithium in the prevention of suicide in mood disorders: Updated systematic review and meta-analysis. BMJ 2013;346:f3646.
14Andrade C. Ketamine for depression. 1. Clinical summary of issues related to efficacy, adverse effects, and mechanism of action. J Clin Psychiatry 2017;78:e415-9.
15Andrade C. Ketamine for depression, 2: Diagnostic and contextual indications. J Clin Psychiatry 2017;78:e555-8.
16Andrade C. Ketamine for depression: 3. Does chirality matter? J Clin Psychiatry 2017;78:e674-7.
17Andrade C. Ketamine for depression, 4: In what dose, at what rate, by what route, for how long, and at what frequency? J Clin Psychiatry 2017;78:e852-7.
18Andrade C. Ketamine for depression: 5. Potential pharmacokinetic and pharmacodynamic drug interactions. J Clin Psychiatry 2017;78:e858-61.
19Larkin GL, Beautrais AL. A preliminary naturalistic study of low-dose ketamine for depression and suicide ideation in the emergency department. Int J Neuropsychopharmacol 2011;14:1127-31.
20Burger J, Capobianco M, Lovern R, Boche B, Ross E, Darracq MA, et al. A double-blinded, randomized, placebo-controlled sub-dissociative dose ketamine pilot study in the treatment of acute depression and suicidality in a military emergency department setting. Mil Med 2016;181:1195-9.
21Bartoli F, Riboldi I, Crocamo C, Di Brita C, Clerici M, Carrà G, et al. Ketamine as a rapid-acting agent for suicidal ideation: A meta-analysis. Neurosci Biobehav Rev 2017;77:232-6.
22Price RB, Iosifescu DV, Murrough JW, Chang LC, Al Jurdi RK, Iqbal SZ, et al. Effects of ketamine on explicit and implicit suicidal cognition: A randomized controlled trial in treatment-resistant depression. Depress Anxiety 2014;31:335-43.
23Price RB, Nock MK, Charney DS, Mathew SJ. Effects of intravenous ketamine on explicit and implicit measures of suicidality in treatment-resistant depression. Biol Psychiatry 2009;66:522-6.
24Murrough JW, Soleimani L, DeWilde KE, Collins KA, Lapidus KA, Iacoviello BM, et al. Ketamine for rapid reduction of suicidal ideation: A randomized controlled trial. Psychol Med 2015;45:3571-80.
25Sanacora G, Frye MA, McDonald W, Mathew SJ, Turner MS, Schatzberg AF, et al. A consensus statement on the use of ketamine in the treatment of mood disorders. JAMA Psychiatry 2017;74:399-405.