RecruitingPhase 1Drug trialFeasibility and Safety of Ketamine for Suicidal Patients in the Emergency DepartmentThere is currently no readily available pharmacologic intervention for suicidal ideation, a true psychiatric emergency, in the Emergency Department (ED). Investigators aim to trial low-dose, intravenous ketamine, a drug with well-established use in treatment-resistant depression, for patients who present to the ED with suicidal ideation.