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Adverse effects n (%) (n = 30)
| Adverse effect | Butorphanol group | Meperidine group | P value |
| Any side effect | 16 (53.3) | 10 (33.3) | 0.192 |
| Somnolence | 10 (33.3) | 5 (16.7) | 0.23 |
| Dizziness | 6 (20.0) | 4 (13.3) | 0.73 |
| Nausea | 5 (16.7) | 4 (13.3) | 1.00 |
| Vomiting | 2 (6.7) | 2 (6.7) | 1.00 |
