Effect of time of pretreatment with intrathecal dextromethorphan, maximum usable dose (250 μg) on the formalin test phase 2A
| Time of Pretreatment (min) | N | Mean No. of Flinches, Phase 2A | S.E. |
|---|---|---|---|
| −15 | 11 | 65.6 | 12.7 |
| −30 | 4 | 57.5 | 23.2 |
| −120 | 6 | 80 | 11.0 |
No significant differences were observed (P = .65, F = .441, one-way ANOVA).