| Methods | D: crossover C: unclear B: double WD: 6/16 J: 1‐1‐0 DU: ‐/2x8 (no washout)/‐ | |
| Participants | N: 16/10 D: migraine C: unclear F: 80% A: mean 41 years DU: mean 17 years S: outpatient department, UK | |
| Interventions | P: 120 mg C: Placebo | |
| Outcomes | R: not reported F: 21 vs. 24 headache days in 56 days (sd not reported) AU: not reported HI: 47 vs. 52 AEs: not reported Dropouts‐AEs: not reported V: (+) | |
| Notes | Small study with high dropout rate | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Unclear risk | B ‐ Unclear |
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