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| Combined phase | Morphine-alone phase | |
|---|---|---|
| Nausea* | 1 | 8 |
| Vomiting* | 0 | 7 |
| Dry mouth | 3 | 2 |
| Hallucination | 0 | 0 |
| Somnolence | 7 | 11 |
| Pruritus | 1 | 1 |
| Constipation | 4 | 5 |
| Sensation of empty head | 1 | 0 |
| Anorexia | 14 | 13 |
| Dyspnoea | 0 | 0 |
| Acceptance to the study drugs | 22 | 21 |
| Patient satisfaction | 22 | 18 |
