In my work, I will be studying mitragynine as a possible treatment for both mechanical allodynia and thermal hyperalgesia. In Sprague Dawley rats, the sciatic nerve will be tied off, simulating a sciatic nerve injury in humans via the chronic constriction model, or CCI. Matched controls will undergo a sham surgery where the nerve is left untouched. Prior to the surgery all rats will be baselined via the von Frey assay for mechanical allodynia, as well as a hot plate test. Mitragynine will be given at differing doses, and the rats will be subjected to both the von Frey assay as well as the hot plate at different pre-treatment times. After the rats have been behaviorally verified in both the von Frey and hot plate test, tissues will be collected and analyzed via immunohistochemistry in order to see if any morphological or anti-inflammatory differences presented as a result of the mitragynine.