Fig. 5. Effects of intrathecal pretreatment of idazoxan, a selective α2-adrenoceptor antagonist, on the antihypersensitivity effect of 1 μg T62. Rats were pretreated with saline or alternatively pretreated with idazoxan 15 min before T62 administration. * P < 0.05, ** P < 0.01 versus the group treated with saline plus T62. %MPE = percentage of the maximum possible effect.