Carbamazepine is a tricyclic compound chemically related to tricyclic antidepressants (TCA) with anticonvulsant and analgesic properties. Carbamazepine exerts its anticonvulsant activity by reducing polysynaptic responses and blocking post-tetanic potentiation. Its analgesic activity is not understood; however, carbamazepine is commonly used to treat pain associated with trigeminal neuralgia.
在蟾毒素存在时,Carbamazepine没有改变蝎毒素(125I-标记)结合到突触体中, 但是加入1.25 μM蟾毒素, Carbamazepine浓度依赖性抑制蟾毒素依赖的蝎毒素结合的提高(IC50:260 μM),通过毒素生物碱结合位点调节, 对[3H]蛤蚌毒素结合没有影响。作用于大鼠脑突触时,Carbamazepine抑制[3H]Batrachotoxinin A 20-α-benzoate与电压敏感的钠离子通道位点受体结合(IC50:131 μM), 从而使钠离子通道离子流活性降低。因为配体从受体-配体复合体中解离速率提高,Carbamazepine尽管会降低受体亲和力但不会改变从[3H]Batrachotoxinin A 20-α-benzoate 结合到突触体的Scatchard分析中的最大结合能力,表明[3H]Batrachotoxinin A 20-α-benzoate的结合对抗惊厥的间接变构有抑制作用。