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Haloperidol versus placebo – 1 trial, 40 participants [15]
| Main outcomes | Hal'dol | Placebo | RR (95% CI) |
| Not improved by 2 hours | 2/29 | 4/11 | 0.19 (0.04–0.9) |
| Needing another injection | Majority in both groups | ||
| Mental state: asleep – by 2 hours | 1/29 | 0/11 | - |
| Leaving the study early | 0/29 | 0/11 | - |
| Adverse effects: needing antiparkinsonian medication | 6/29 | 0/11 | - |
