Older adults are sorely underrepresented in suicide prevention research, despite the fact that suicide rates are higher in this age group than in any other age group in Sweden and in many countries worldwide. There are extremely few clinical intervention studies that target this age group, with to date no published studies in Europe. The overall aim is to develop and test a modified version of the Attempted Suicide Short Intervention Program (ASSIP), which the investigators will adapt specifically for older adults (65+). The original ASSIP was developed in Switzerland where it has shown an 80% decrease in risk of new suicide attempts compared to ordinary treatment. In Sweden, ASSIP is currently being tested for persons aged 18+ . The investigators now propose a randomised controlled trial (RCT) to evaluate a modification of ASSIP specifically designed to meet the needs of suicidal persons aged 65 and above, the ASSIP-Older Adult program (ASSIP-OA).

Main study questions

1. Compared to treatment as usual (TAU), will the addition of the ASSIP-OA to ordinary treatment have a preventive effect on suicide and suicide attempts within 6, 12, and 24 months following the index episode?
2. Compared to TAU, do ASSIP-OA participants show better improvement in coping skills and psychiatric symptoms a) after the last session and b) at 6-,12- and 24- month follow-up?
3. Is a brief preventive intervention (ASSIP-OA) for older adults feasible, based on its acceptability, appropriateness, deliverability and fidelity? Do participants experience side effects? Do they have fewer days of inpatient care?
4. What kind of challenges and opportunities do a) older adults and b) ASSIP-OA therapists experience in relation to implementing a brief preventive intervention like ASSIP-OA? Are the modifications that the investigators made in ASSIP-OA relevant for older adults?

Inclusion Criteria:

1. Age 65 and above at time of index suicide attempt or hospitalisation for serious suicidal plans.
2. A mental health care contact during the active treatment period.
3. Capable of understanding study procedures and providing informed consent.

Exclusion Criteria:

1. Clinical diagnosis of dementia or MoCa score less than -2 standard deviations from the normative score for education and age (Borland et al., 2017). Ongoing delirium, or any other condition impeding the comprehension of the study's procedures and implications that hinder the provision of informed consent.
2. Severe ongoing psychosis, severe ongoing substance use disorder, emotionally instable personality syndrome and any other condition that would require longer specialized treatment to reduce future suicidal behaviour (e.g. DBT).
3. Terminal illness.
4. Insufficient knowledge of the Swedish language (requires interpreter).
5. Aphasia or other severe communication issue or severe hearing and/or severe visual impairment that render the intervention unfeasible despite corrective aids.

The individual participant data (IPD) from this study will not be shared publicly, as we do not have ethical approval for individual data sharing. Any inquiries regarding access to the data should be directed to the Swedish Ethical Review Board, which oversees ethical considerations related to data access and use: registrator@etikprovning.se