Preventing suicidal behavior starts with recognizing warning signs early, strengthening social connections, and knowing how to respond when someone is in crisis. No single action eliminates risk entirely, but a combination of awareness, communication, professional support, and environmental changes can significantly reduce the likelihood that suicidal thoughts escalate into action. Here’s what works, based on the best available evidence.
Recognizing the Warning Signs
Prevention depends on early recognition. The National Institute of Mental Health identifies several categories of warning signs that suggest someone may be thinking about suicide. These fall into what a person says, how they feel, and how their behavior changes.
Verbal cues include talking about wanting to die, expressing feelings of being a burden to others, or voicing deep guilt or shame. Emotional shifts are also telling: feeling empty, hopeless, or trapped, experiencing unbearable emotional or physical pain, or becoming noticeably more anxious, agitated, or full of rage.
Behavioral changes often carry the most urgency. Watch for someone who begins withdrawing from friends, saying goodbye to people, giving away meaningful possessions, or making a will. Researching methods of death, taking dangerous physical risks, displaying extreme mood swings, sleeping or eating significantly more or less than usual, and increasing drug or alcohol use are all signs that someone’s risk level may be rising. None of these signs in isolation confirms a plan, but clusters of them, especially when they appear suddenly, warrant direct conversation and action.
How to Respond in a Crisis
If you notice warning signs in someone you care about, the most effective immediate step is to ask them directly whether they’re thinking about suicide. Research consistently shows that asking does not plant the idea. It opens a door. Listen without judgment, validate their pain, and help them connect to professional support.
The 988 Suicide and Crisis Lifeline (call or text 988) connects people to trained counselors 24 hours a day. Calls are routed first to local crisis centers and, if those are unavailable, to a national backup network so that every contact receives a response. For people who prefer not to speak on the phone, text and chat options are available through the same number.
A safety plan is one of the most practical tools you can create with someone who is at risk. Developed by clinical researchers Barbara Stanley and Gregory Brown, the safety planning approach walks a person through a structured set of steps they can follow when suicidal thoughts intensify. The core idea is to identify personal warning signs, list internal coping strategies (things the person can do alone to shift their mental state), name specific people and places that provide distraction or support, and write down professional contacts and crisis numbers. The plan also includes a step for making the environment safer by reducing access to lethal means, particularly firearms and medications. Having a written, portable plan gives someone a concrete action sequence to follow during their most vulnerable moments.
Therapies That Reduce Suicidal Behavior
Two forms of psychotherapy have the strongest track record for reducing suicidal thoughts and attempts: cognitive behavioral therapy (CBT) and dialectical behavior therapy (DBT). A systematic review in Frontiers in Psychology found that across multiple studies, these therapies led to reductions in suicidal ideation in 55% of cases and reductions in suicide attempts in 37.5% of cases.
CBT works by helping people identify and restructure the thought patterns that make a crisis feel inescapable. A specialized version called CBT for Suicide Prevention focuses specifically on the beliefs, emotions, and situations that precede suicidal episodes. Even brief versions have shown results. A one-week internet-based CBT program and a two-month program in primary care settings both reduced suicidal ideation in controlled studies.
DBT was originally developed for people with borderline personality disorder but has proven effective across a broader range of conditions. It teaches four skill sets: mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness. These skills directly address the emotional overwhelm and impulsivity that often precede suicidal crises. Multiple studies, including those involving adolescents, have documented reductions in both suicidal thoughts and suicide attempts following DBT treatment.
A newer approach, Acceptance and Commitment Therapy, showed promising results in a study where just seven sessions decreased both the frequency and intensity of suicidal ideation. The key takeaway is that effective therapy exists, and some versions work in surprisingly short timeframes.
Medications With Anti-Suicidal Effects
For people with bipolar disorder or schizophrenia, specific medications have demonstrated direct anti-suicidal properties beyond their general mood-stabilizing effects.
Lithium is the best-studied. A large Swedish study of over 51,000 patients found that lithium treatment reduced suicide-related events by 14% compared to periods without treatment. A Taiwanese study following more than 25,000 people with bipolar disorder over 16 years found lithium carried the lowest mortality risk of all mood stabilizers studied. In a controlled trial, patients receiving lithium had an 18.8% risk of suicidal behavior over 12 months, compared to 24.3% for those on placebo.
For people with schizophrenia, clozapine stands out. It was the only antipsychotic consistently associated with decreased suicide risk across multiple large studies. In one analysis, clozapine users had a 63% lower risk of suicide mortality compared to non-users. Another found that people taking other antipsychotics had more than double the suicide risk compared to those on clozapine. These medications require careful monitoring, but for people with serious mental illness, they represent a meaningful layer of protection.
Protective Factors That Lower Risk
Prevention isn’t only about identifying danger. It’s also about building the conditions that make suicidal behavior less likely. The CDC identifies protective factors at the individual, relationship, community, and societal levels.
At the individual level, effective coping and problem-solving skills are among the strongest buffers. People who can generate alternative solutions when faced with a crisis are less likely to view suicide as the only option. Having clear reasons for living, whether family, friends, pets, or a sense of purpose, also provides a psychological anchor during dark periods. A strong sense of cultural identity offers similar protection.
At the relationship level, support from partners, friends, and family is consistently linked to lower suicide risk. This doesn’t mean simply being around other people. It means having relationships where someone feels genuinely known and valued. For anyone trying to help prevent suicide in someone they love, one of the most powerful things you can do is maintain consistent, nonjudgmental contact. Check in regularly. Don’t wait for a crisis to reach out.
Community-level factors include access to mental health care, connectedness to school or workplace communities, and cultural or religious beliefs that discourage suicide. These aren’t factors any one person controls, but they shape the broader environment that either supports or fails people in distress.
School-Based Prevention Programs
For young people, school-based programs offer one of the most effective population-level prevention strategies. The Signs of Suicide (SOS) program, which combines education about depression with a brief self-screening tool, was the first school-based program to demonstrate a significant reduction in suicide attempts in a randomized controlled trial.
Students who went through the SOS program were approximately 40% less likely to report a suicide attempt in the three months following the program compared to students who didn’t participate. The attempt rate dropped from 5.4% in the control group to 3.6% in the intervention group. Students also showed greater knowledge about depression and more adaptive attitudes toward seeking help. The program works because it teaches young people to recognize warning signs in themselves and their peers and gives them a simple framework for responding: acknowledge the problem, care about the person, and tell a trusted adult.
Gatekeeper Training for Non-Professionals
Most people who die by suicide have had recent contact with someone who noticed something was wrong but didn’t know what to do. Gatekeeper training programs address this gap by teaching everyday people, including teachers, coaches, employers, and community members, how to recognize risk and connect someone to help.
The most widely used program is Question, Persuade, Refer (QPR). Research on QPR trainees who work with youth found both short-term and long-term improvements in knowledge about suicide, confidence in their ability to intervene, and actual help-giving behaviors. These gains were still measurable two years after the initial training. QPR doesn’t turn participants into therapists. It gives them enough skill and confidence to have the conversation that bridges the gap between a person in crisis and professional care.
Supporting Survivors of Suicide Loss
When someone dies by suicide, the people closest to them face an elevated risk of suicidal behavior themselves. Postvention, the set of activities designed to support people bereaved by suicide, is itself a form of prevention.
The most effective approach is active postvention, where support is brought directly to survivors rather than waiting for them to seek help on their own. In schools, this means using screening tools to identify students experiencing post-traumatic stress, anxiety, or depression after a peer’s death, then providing immediate mental health support and consistent follow-up. Educational sessions that normalize grief reactions and teach adaptive coping strategies help prevent the isolation and hopelessness that can develop in the aftermath of a suicide. For families, the priority is the same: immediate, sustained, and proactive support that doesn’t fade after the first few weeks.
Reducing Access to Lethal Means
One of the most effective and underused prevention strategies is simply putting time and distance between a person in crisis and the means to act on suicidal thoughts. Suicidal crises are often intense but brief. Many people who survive a serious attempt report that the window of acute intent lasted minutes, not hours. If lethal means aren’t immediately available during that window, the person often survives and does not go on to die by suicide later.
Practically, this means securing firearms with trigger locks, cable locks, or by storing them outside the home during a crisis. It means keeping medications in locked locations and disposing of unused prescriptions. If you’re supporting someone at risk, having a conversation about temporarily reducing access to these items is one of the highest-impact actions you can take. It doesn’t require removing every possible risk. It requires creating enough of a barrier to outlast the most dangerous moments.