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Comparison 2: hydromorphone versus morphine (adverse events)
| Adverse event | Hydromorphone | Morphine | ||
| No of reports | Treatment related | No of reports | Treatment related | |
| Abdominal discomfort/pain | 2 | 1 | 5 | 1 |
| Confusion | 1 | 1 | 1 | 0 |
| Constipation | 1 | 1 | 2 | 1 |
| Dizziness | 2 | 2 | 2 | 2 |
| Drowsiness | 0 | 0 | 2 | 2 |
| Fatigue | 0 | 0 | 1 | 1 |
| Nausea | 3 | 2 | 2 | 0 |
| Vomiting | 3 | 1 | 2 | 0 |
| Others | 22 | 0 | 38 | 0 |
| TOTAL | 33 | 8 | 55 | 7 |
