BackgroundUnderstanding relationships between substance use and suicidal ideation and behaviour (SIB) has important public health implications for suicide prevention in low- and middle-income countries (LMICs), where 75% of suicides occur. This systematic review explored the associations between substance use and SIB in LMICs.MethodsWe searched five databases using a combination of keywords for substance use, SIB and LMICs to identify English-written quantitative studies published between January 2006 and February 2016. Data were extracted to provide an overview of what is known about the topic, highlight gaps in the literature, and explore the implications of current knowledge for suicide prevention. Studies included in the review were assessed for methodological quality using the Scottish Intercollegiate Guidelines Network checklist.ResultsAnalysis of included studies (N = 108) demonstrated a consistent positive association between substance use and SIB across all substances (i.e. alcohol, tobacco, cannabis, illicit drugs, non-medical use of prescription drugs), all substance use dimensions (i.e. intoxication, use, and pathological use) and all SIB dimensions (i.e. suicidal ideation, non-fatal suicidal behaviour, and suicide). Most of the available research evidence comes from upper-middle-income countries, only 22% comes from lower-middle-income and low-income countries. Most studies focused on alcohol and tobacco, while neglecting substances such as cannabis, opioids, sedatives, stimulants, misuse of prescription medication, inhalants, and hallucinogens. Most of the studies employed a cross-sectional design, were conducted within a risk-factor paradigm, and provided little information about the potential interaction between variables.ConclusionsPublic health suicide prevention policy and research in LMICs should take account of the fact that: substance use is a potentially modifiable risk factor; assessment and management of substance use is integral to the care of at-risk patients; reducing consumption and hazardous use of substances in LMICs is important for suicide prevention; and research needs to be expanded to include more theory driven research that focuses on all substance use dimensions and SIB dimensions, while employing more sophisticated statistical methods.Electronic supplementary materialThe online version of this article (10.1186/s12889-018-5425-6) contains supplementary material, which is available to authorized users.

The ways in which mental health care providers think about suicide and make sense of their experiences affects their perceived abilities to prevent suicide. Educating mental health care providers to transcend the limitations of risk factor approaches to suicide prevention and utilise evidence-based strategies for treating substance use disorders and associated problems, may be important to empower them and make them feel competent in suicide prevention. Empowering people with substance use disorders may help prevent suicide and may require collaboration between mental health care providers and allied professionals.

BackgroundPeople with substance use disorders (PWSUDs) are a clearly delineated group at high risk for suicidal behaviour. Expert consensus is that suicide prevention strategies should be culturally sensitive and specific to particular populations and socio-cultural and economic contexts. The aim of this study was to explore mental health care providers' context- and population-specific suggestions for suicide prevention when providing services for PWSUDs in the Western Cape, South Africa.MethodsQualitative data were collected via in-depth, semi-structured interviews with 18 mental health care providers providing services to PWSUDs in the public and private health care sectors of the Western Cape, South Africa. Data were analysed inductively using thematic analysis.ResultsParticipants highlighted the importance of providing effective mental health care, transforming the mental health care system, community interventions, and early intervention, in order to prevent suicide amongst PWSUDs. Many of their suggestions reflected basic principles of effective mental health care provision. However, participants also suggested further training in suicide prevention for mental health care providers, optimising the use of existing health care resources, expanding service provision for suicidal PWSUDs, improving policies and regulations for the treatment of substance use disorders, provision of integrated health care, and focusing on early intervention to prevent suicide.ConclusionsTraining mental health care providers in suicide prevention must be augmented by addressing systemic problems in the provision of mental health care and contextual problems that make suicide prevention challenging. Many of the suggestions offered by these participants depart from individualist, biomedical approaches to suicide prevention to include a more contextual view of suicide prevention. A re-thinking of traditional bio-medical approaches to suicide prevention may be warranted in order to reduce suicide among PWSUDs.Electronic supplementary materialThe online version of this article (10.1186/s13011-018-0185-y) contains supplementary material, which is available to authorized users.

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BackgroundSuicide is a serious public health problem in low- and middle-income countries. Understanding the context- and gender-specific risk factors for non-fatal suicidal behaviour is the cornerstone of evidence-based public health interventions to reduce suicide. Poverty and symptoms of depression are well established risk factors for suicidal behaviour. However, little is understood about how proximal economic factors (such as losing one’s job, or food insecurity) may confound the effects of symptoms of depression to increase the risk of non-fatal suicidal behaviour in vulnerable populations, such as young men living under conditions of endemic poverty. The aim of this study was to explore the extent to which a wide range of poverty-related variables account for non-fatal suicidal behaviour independent of, or in addition to, symptoms of depression among young men living in low-resource communities in South Africa (SA).MethodsData were collected from a clustered sample of 647 young men living in low-resource communities in the Western Cape province of SA. Multivariate regressions were used to identify the associations between poverty-related measures, symptoms of depression, and past-month prevalence of non-fatal suicidal behaviour.ResultsNon-fatal suicidal behaviour in the last month was reported by 47 (6.13%) participants: suicidal ideation (n = 43; 5.97%); suicide plan (n = 5; 0.77%); suicide attempt (n = 4; 0.62%), and deliberate self-harm without intent to die (n = 4; 0.62%). Past-month prevalence of non-fatal suicidal behaviour was significantly associated with particular dimensions of poverty (living in a home without a toilet on the premises, having previously been fired, and food insecurity), but not with other dimensions of poverty (such as prolonged unemployment and low levels of income). However, symptoms of depression were a more significant predictor of non-fatal suicidal behaviour than any measure of poverty (aOR=1.093, 95% CI=1.058-1.129, p < .000).ConclusionsDepressive symptoms are more strongly associated with non-fatal suicidal behaviour than a range of proximal and distal economic factors among young men living under conditions of endemic poverty in South Africa. This has important public health implications and highlights the importance of increasing young men’s access to psychiatric services and targeting depression as an integral component of suicide prevention in low resource communities.Electronic supplementary materialThe online version of this article (10.1186/s12889-018-6104-3) contains supplementary material, which is available to authorized users.