代谢
奥卡西平迅速且广泛地代谢为其主要代谢物MHD,MHD负责其大部分的抗癫痫活性,并且存在于血浆中的浓度远高于母药。MHD通过细胞质肝酶中的aldo-keto还原酶家族的几个成员的还原作用形成,并以大约80%(S)-MHD对20%(R)-MHD的比例作为外消旋混合物存在于血浆中。MHD进一步代谢为葡萄糖醛酸结合物代谢物以供排泄,少量被氧化为10-,11-二氢-10,11-二羟基卡马西平(DHD),后者在药理上不活跃。给予的奥卡西平剂量的仅有10%将保持为母药或母药的葡萄糖醛酸结合物。
Oxcarbazepine is rapidly and extensively metabolized to its primary metabolite, MHD, which is responsible for the bulk of its anti-epileptic activity and exists in much higher concentrations in the plasma than the parent drug. MHD is formed via reduction by several members of the aldo-keto reductase family of cytosolic liver enzymes and exists as a racemate in plasma in an approximate ratio of 80% (S)-MHD to 20% (R)-MHD. MHD is further metabolized to glucuronide conjugate metabolites for excretion, and small amounts are oxidized to 10-,11-dihydro-10,11-dihydroxycarbamazepine (DHD) which is pharmacologically inactive. Only 10% of an administered dose of oxcarbazepine will remain as either the parent drug or glucuronide conjugates of the parent drug.
来源:DrugBank