Ketamine Treatment for Veterans with Back Pain and Depression

Inclusion Criteria: * Veterans with self-report of moderate to severe, high impact chronic low back pain (defined as 4/10 in severity via NRS, present 3 months on most days) and associated pain interference (defined as T-score 60 on the PROMIS Pain Interference measure), and current significant depressive symptoms (defined as a score 11 on the Quick Inventory of Depressive Symptoms - Self Report (QIDS-SR). * Medically stable (no hospitalizations in the past month lasting 3 days). * No changes in pain or depression medication regimen in 4 weeks. * No planned surgery, injections, hospitalizations, or other new interventions for back pain (except for physical therapy or exercise) or depression during the next four months (study duration). * Participants must have an adult who can drive them home after the ketamine treatments. Exclusion Criteria: * Inability to speak English due to the narrative intervention being conducted in English. * Inability or unwillingness to provide written informed consent (e.g. current delirium). * Current psychotic symptoms, or history of schizophrenia, schizoaffective disorder, and other psychotic disorder. * Currently participating in another clinical trial for pain or depression. * Current uncontrolled hypertension (defined as systolic blood pressure \>160 mmHg and/or diastolic blood pressure \>100 mmHg). * Known elevated intracranial pressure, cerebral arterial aneurysm, or elevated intraocular pressure. * History of cirrhosis or unstable cardiac condition (e.g., decompensated congestive heart failure). * Any of the following lab values \>2x upper limit of normal: alanine transaminase (ALT), aspartate transferase (AST), direct bilirubin, alkaline phosphatase, creatinine; thyroid stimulating hormone (TSH) \<2x lower limit of normal or \>2x upper limit of normal. * Positive urine pregnancy test or lack of birth control method in Veterans of childbearing potential. * Known hypersensitivity to any excipient in the ketamine injection formulation. * Previously experienced serious adverse effects with ketamine. * On day of ketamine infusions, a urine drug screen positive for non-prescribed substances(s) (except cannabis) will exclude a participant from receiving ketamine * Current or previous abuse of ketamine.