Peripheral nerve blocks are commonly preferred worldwide for the purposes of anesthesia application and postoperative analgesia. In this study, we investigated the effects of phenytoin which has a similar mechanism to local anesthetics in terms of the duration of analgesia and quality. The study was performed on 32 Sprague-Dawley male rats. Rats were randomly grouped into 4 groups. Group S: Sham group (n: 8); 0,2 ml saline perineural unilateral sciatic nerve. Group L: Perineural levobupivacaine (0,2 ml 0,5% levobupivacaine, n: 8); Group Ph: Perineural phenytoin (0,2 ml 62,5 mg / kg, n: 8); Group L + PH: Perineural phenytoin and levobupivacaine (0,2 ml 0,5% levobupivacaine + 62,5 mg / kg phenytoin, n: 8). Hot-plate and tail- flick tests were performed to measure acute thermal pain and histological changes were evaluated. The latency time at 30 minute in Group L+Ph were significantly increased when compared to the other groups during evaluation of the hot plate test. There was a significant difference in terms of latency time at 30 minute in Group L+Ph in the Tail Flick test and the latency time in Group L+Ph was longer when compared to the other groups (p
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