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Suicide claims more than 47,000 American lives each year, making it a leading cause of death across age groups. For every death, researchers estimate that there are roughly 25 attempts. The scale of the problem is staggering, yet suicide prevention has historically received far less research funding and policy attention than other public health priorities of comparable magnitude. Evidence on what works has grown substantially over the past two decades. Researchers have identified several intervention approaches with consistent empirical support, as well as a number of popular strategies that the evidence does not support. Understanding the distinction matters enormously for practitioners, policymakers, and communities investing in prevention efforts. Means restriction is among the most consistently supported prevention strategies in the literature. The principle is straightforward: suicide attempts are often impulsive, and reducing access to lethal means during a moment of crisis saves lives. Research on firearm access and suicide risk is particularly robust. Studies consistently show that households with firearms have substantially higher rates of suicide death, even when accounting for other risk factors. States with stronger firearm safety laws have lower suicide rates. Installing barriers on bridges and other jump sites has been shown to reduce deaths at those locations without evidence of substitution to other methods. Means counseling, which involves discussing lethal means reduction with at-risk individuals and their families, is increasingly recommended as part of clinical care. Crisis lines and text services provide immediate support to individuals in acute distress. The 988 Suicide and Crisis Lifeline expanded significantly in 2022 with the introduction of the three-digit calling code. Research on crisis line outcomes shows reductions in psychological pain and hopelessness among callers, and the service has demonstrated particular effectiveness in connecting callers to follow-up care. However, staffing shortages have meant that call volume often exceeds capacity, and disparities in call wait times have been documented across demographic groups. Clinical interventions show strong evidence for specific populations. Cognitive behavioral therapy for suicide prevention, developed specifically for suicidal individuals, has demonstrated effectiveness in reducing attempts in multiple randomized trials. Dialectical behavior therapy, originally developed for borderline personality disorder, has a strong evidence base for reducing self-harm and suicidal behavior in chronically suicidal patients. Collaborative safety planning, which involves developing a personalized plan for managing suicidal crises, is recommended as a brief intervention that can be delivered in diverse settings. Medication plays a role for some patients. Lithium has the strongest evidence base for suicide risk reduction among psychiatric medications, particularly for patients with mood disorders. Clozapine is the only medication with an FDA indication for reducing suicidal behavior in schizophrenia and schizoaffective disorder. The evidence for ketamine and its derivatives as rapid-acting antisuicidal agents has grown, though questions about maintenance protocols remain. Antidepressants carry a black box warning about suicidal ideation in young people, a warning that has been critiqued on methodological grounds and whose clinical implications remain debated. School-based prevention programs have accumulated a mixed but generally positive evidence base. Programs focused on skill-building, help-seeking behavior, and crisis recognition have shown benefits in several trials. Gatekeeper training, which teaches adults in schools and communities to recognize warning signs and connect at-risk individuals to help, has demonstrated effectiveness in some studies. Universal screening programs have raised ethical questions about identification without adequate referral capacity, and this concern is legitimate wherever screening is not linked to accessible follow-up services. Population-level approaches, including responsible media reporting guidelines and public awareness campaigns, have shown mixed results. Evidence that graphic media coverage of suicide increases rates in vulnerable populations is strong, and reporting guidelines have been developed to address this. The effectiveness of general public awareness campaigns in reducing suicide rates is less clear, though campaigns focused on reducing stigma and promoting help-seeking have shown some benefits. What does not work is also important to know. Boot camp-style programs that use fear and shock to deter suicidal thinking have not demonstrated effectiveness. Programs that focus primarily on suicide awareness without connecting individuals to actionable resources can sometimes increase distress without benefit. Zero-tolerance disciplinary responses to students who disclose suicidal thinking can deter help-seeking and worsen outcomes. The social determinants of suicide deserve greater policy attention. Poverty, unemployment, housing instability, social isolation, exposure to violence, and discrimination are consistently associated with elevated suicide risk. Interventions that address these upstream factors, including economic supports, housing programs, and anti-discrimination policies, can reduce population-level risk in ways that clinical interventions alone cannot achieve. Investment in suicide prevention infrastructure, including research funding, crisis service capacity, clinical training, and community programs, has lagged behind the magnitude of the problem. The evidence base is strong enough to justify confident investment in approaches we know work. The question is whether political will exists to fund them at scale.

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''Originally published June 28, 2022 on [https://docmoates.com/blog/suicide-prevention-what-research-shows-actually-works/ docmoates.com].''