Intranasal racemic ketamine for patients hospitalized with treatment-resistant depression: A retrospective analysis.

Most research describing ketamine as a treatment for depression has relied on intravenous dosing. There remains a need for more research to support this treatment with other routes of administration. This was a retrospective chart review of 30 patients hospitalized with unipolar or bipolar treatment-resistant depression who were treated with up to four doses of compounded intranasal racemic ketamine (50 mg or 75 mg). Treatment courses lasted up to 7 days. Symptom improvement was measured with either the Hamilton Depression Rating Scale or the Montgomery-Åsberg Depression Rating Scale. Ketamine was well tolerated with no severe adverse events or treatment discontinuations due to adverse effects. Blood pressures increased by 4-6 mmHg on average with no patients requiring medication to lower blood pressure. Twenty patients (66.7%) were classified as treatment responders based on depression scores decreasing by more than 50%. Among the 27 patients with moderate to severe suicidal ideation scores at baseline, these decreased by 68.5% on average. Overall, the results suggest that compounded intranasal racemic ketamine was safe and effective in the treatment of depressive symptoms and suicidal ideation in a real-world sample of patients hospitalized with treatment-resistant depression. Additional research comparing intranasal ketamine to esketamine and intravenous racemic ketamine is warranted. (PsycInfo Database Record (c) 2023 APA, all rights reserved).