Keywords: CCI; chronic constriction injury; DRG; dorsal root ganglia; i.p.; intraperitoneal; 5-HT; serotonin; NA; noradrenaline; TCA; tricyclic antidepressants; SNRIs; Serotonin and Norepinephrine Reuptake Inhibitors; SSRIs; Selective Serotonin Reuptake Inhibitors;