title: Comparative activity of the anti-convulsants oxcarbazepine, carbamazepine, lamotrigine and gabapentin in a model of neuropathic pain in the rat and guinea-pig.
abstract: Anti-epileptic drugs (AEDs) are increasingly used for the treatment of neuropathic pain. Oxcarbazepine is a recently introduced AED that is effective in treating epilepsy and has an improved side-effect profile compared to existing therapies. Here we have examined the effect of oxcarbazepine and other AEDs in a model of neuropathic pain in the rat and guinea-pig. Oxcarbazepine and carbamazepine (3-100 mg x kg(-1)) did not affect mechanical hyperalgesia or tactile allodynia induced by partial sciatic nerve ligation in the rat following oral administration. However, in the same model in the guinea-pig, both drugs produced up to 90% reversal of mechanical hyperalgesia with respective D(50) values of 10.7 and 0.8 mg x kg(-1). The active human metabolite of oxcarbazepine, monohydroxy derivative, was similarly active against mechanical hyperalgesia in the guinea-pig but not the rat. Lamotrigine (3-100 mg x kg(-1), p.o.) was effective against mechanical hyperlagesia in both species although it showed greater efficacy and potency in the guinea-pig (D(50) 4.7 mg x kg(-1)) compared to the rat (D(50) 27 mg kg(-1)). Lamotrigine produced slight inhibition of tactile allodynia in the rat only at the highest dose tested of 100 mg x kg(-1). Gabapentin was poorly active against mechanical hyperalgesia in both the rat and guinea-pig following a single oral administration (100 mg x kg(-1)), although upon repeated administration it produced up to 70 and 90% reversal in rat and guinea-pig, respectively. Gabapentin did however produce significant dose-related reversal of tactile allodynia in the rat following a single administration. These data show that oxcarbazepine and other AEDs are effective anti-hyperalgesic or anti-allodynic agents in an animal model of neuropathic pain, and provide further support for their use in the treatment of neuropathic pain in the clinic.
mesh_terms: D000085:Acetates / Q000494:pharmacology*; D000588:Amines; D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology*; D002220:Carbamazepine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D003509:Cyclohexanecarboxylic Acids; D000077206:Gabapentin; D006168:Guinea Pigs; D006930:Hyperalgesia / Q000209:etiology / Q000503:physiopathology; D000077213:Lamotrigine; D008297:Male; D009437:Neuralgia / Q000209:etiology / Q000503:physiopathology*; D000078330:Oxcarbazepine; D017288:Pain Threshold; D011312:Pressure; D051381:Rats; D017208:Rats, Wistar; D012584:Sciatic Nerve / Q000293:injuries; D014110:Touch; D014227:Triazines / Q000494:pharmacology*; D014947:Wounds and Injuries / Q000150:complications; D005680:gamma-Aminobutyric Acid
chemical_list: D000085:Acetates; D000588:Amines; D000927:Anticonvulsants; D003509:Cyclohexanecarboxylic Acids; D014227:Triazines; D002220:Carbamazepine; D005680:gamma-Aminobutyric Acid; D000077206:Gabapentin; D000077213:Lamotrigine; D000078330:Oxcarbazepine