Comparative activity of the anti-convulsants oxcarbazepine, carbamazepine, lamotrigine and gabapentin in a model of neuropathic pain in the rat and guinea-pig

作者：Alyson Fox, Clive Gentry, Sadhana Patel, Adam Kesingland, Stuart Bevan · 发表于：Pain · 年份：2003 · DOI：10.1016/s0304-3959(03)00253-7 · 被引用次数：101 · 研究领域：Pain Mechanisms and Treatments、Botulinum Toxin and Related Neurological Disorders、Pharmacological Effects and Toxicity Studies

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, respec...