J Psychiatr Pract. 2015 Nov;21(6):427-35. doi: 10.1097/PRA.0000000000000106.
Parsaik AK1, Singh B, Khosh-Chashm D, Mascarenhas SS.
This study suggests that ketamine is effective in treatment-resistant bipolar depression and may reduce suicidal ideation and anhedonia… The 2 studies that were excluded from the meta-analysis also showed significant improvement in depression after ketamine therapy. Individual studies also reported improvement in anhedonia and suicidal ideation after ketamine therapy. None of the subjects had serious side effects, and the side effects were similar between the ketamine and placebo groups.