Table 1.

ED₅₀ (µg), slope and total fraction value (TFV) of intrathecal agents in the formalin test

ED₅₀, effective dose producing a 50% reduction of control formalin response; CI, confidence intervals.

^*These values imply the ED₅₀ values of gabapentin in the mixtures of gabapentin-MK801 and gabapentin-NBQX.