Impact of ketamine on suicidal ideation (SI) in those patients who experienced benefit (n=12)
| Onset of reduced SI | n=12 |
| Immediate/during treatment | 2 |
| Within an hour of treatment | 5 |
| A few hours after treatment | 2 |
| A day or more after treatment | 3 |
| Duration of reduced SI | |
| 0–24 hours | 2 |
| Several days | 4 (3–6 days) |
| A week or more | 0 |
| A month or more | 1 |
| Ongoing | 5 |