Title of article :
Gabapentin enhances anti-nociceptive effects of morphine on heat, cold, and mechanical hyperalgesia in a rat model of neuropathic pain
Author/Authors :
-، - نويسنده Physiology Research Center, Kashan University of Medical Sciences, Kashan. Iran Hamidi, Gholam Ali , -، - نويسنده Department of Pharmacology, School of Medicine, AJA University of Medical Sciences, Tehran, Iran Jafari-Sabet, Majid , -، - نويسنده Department of Pharmacology, School of Medicine, Kashan University of Medical Sciences, Kashan. Iran
5 Department of Pharmacology and Toxicology, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Abed, Alireza , -، - نويسنده Physiology Research Center, Kashan University of Medical Sciences, Kashan. Iran .Department of Pharmacology, School of Medicine, Kashan University of Medical Sciences, Kashan. Iran Mesdaghinia, Azam , -، - نويسنده Physiology Research Center, Kashan University of Medical Sciences, Kashan. Iran .Department of Pharmacology, School of Medicine, Kashan University of Medical Sciences, Kashan. Iran Mahlooji, Mohadeseh , -، - نويسنده Department of Addiction Studies, School of Medicine, Kashan University of Medical Sciences, Kashan. Iran
Physiology Research Center, Kashan University of Medical Sciences, Kashan. Iran Banafshe, Hamid Reza
Abstract :
Objective(s):Neuropathic pain is caused by lesions or diseases affecting the somatosensory system and often responds poorly to typical medications. In this study, we evaluated anti-nociceptive effects of morphine, gabapentin and their combination on heat hyperalgesia, cold and mechanical allodynia in chronic constriction injury (CCI) model of neuropathic pain in rats. Materials and Methods: Morphine (2, 4 and 8 mg/kg) and gabapentin (5, 10 and 20 mg/kg) were administered either alone or in combination (morphine 2 mg/kg and gabapentin 5 mg/kg). Results:Our results showed that morphine and gabapentin alone produce anti-nociceptive effects at higher doses (morphine 4 and 8 mg/kg and gabapentin 10 and 20 mg/kg) whereas their combination resulted in better analgesia at lower doses as compared to other treatment groups (morphine 2 mg/kg or gabapentin 5 mg/kg). Conclusion: These findings suggest that gabapentin potentiates the analgesic effects of morphine in the chronic constriction injury (CCI) model of neuropathic pain and combination of these drugs may be considered as a beneficial treatment for neuropathic pain.
