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Number of patients reporting side effects.
| Side effects (n, %) | Tapentadol (n = 20) | Placebo (n = 20) | P |
|---|---|---|---|
| Dizziness | 9 (45) | 3 (15) | |
| Nausea | 9 (45) | 4 (20) | |
| Vomiting | 1 (5) | 0 (0) | |
| Tiredness | 6 (30) | 5 (25) | |
| Headache | 5 (25) | 1 (5) | |
| Shaking | 1 (5) | 1 (5) | |
| Itchiness | 4 (20) | 1 (5) | |
| Vivid dream | 3 (15) | 1 (5) | |
| Obstipation | 4 (20) | 0 (0) | |
| Dry mouth | 2 (10) | 0 (0) | |
| Dyspnea | 0 (0) | 1 (5) | |
| Urinary hesitancy | 1 (5) | 0 (0) | |
| Total (n) | 45 | 17 | <0.001 |
