Drug treatment options for depression can take weeks for the beneficial effects to emerge, which is clearly inadequate for those at immediate risk of suicide. However, intravenous (IV) ketamine, a drug previously used as an anesthetic, has shown rapid antidepressant effects in early trials. […]

Since this was a preliminary study in a small group of depressed patients, further research is needed to replicate these results. However, the findings are promising and could result in improved treatment for suicidal patients in the future.

ScienceDaily: Ketamine Reduces Suicidality In Depressed Patients, Study Suggests