Sex-dependent antiallodynic effect of α adrenergic receptor agonist tizanidine in rats with experimental neuropathic pain.

The purpose of this study was to investigate the mechanism of antiallodynic effect of tizanidine in neuropathic rats. Spinal nerve ligation reduced withdrawal threshold which was interpreted as tactile allodynia. Increasing doses of tizanidine induced a dose-dependent antiallodynic effect in nerve injured rats.