代谢
磺胺异噁唑乙酰是磺胺异噁唑的前药。乙酰基团的添加使得药物在水中难以溶解,并且在体内被水解成活性药物。N1-乙酰磺胺异噁唑通过消化道中的消化酶代谢成磺胺异噁唑,并被吸收为磺胺异噁唑。这种酶切被认为是导致磺胺异噁唑吸收速度减慢和达到较低峰值血药浓度的原因。持续给药乙酰磺胺异噁唑后,血药浓度接近磺胺异噁唑。在一项药代动力学研究中,对健康志愿者单次给予4克乙酰磺胺异噁唑后,小儿悬浮液中磺胺异噁唑的最大血浆浓度范围为122至282微克/毫升(平均值为181微克/毫升),在给药后2至6小时内出现。
Sulfisoxazole acetyl is a prodrug of _sulfisoxazole_. The acetyl group is added to make the drug poorly water-soluble and is hydrolyzed in vivo to the active drug,. N1-acetyl sulfisoxazole is metabolized to sulfisoxazole by digestive enzymes in the gastrointestinal tract and is absorbed as sulfisoxazole. This enzymatic splitting is thought to be responsible for slower absorption and lower peak blood concentrations are achieved after administration of an equal oral dose of sulfisoxazole. With sustained administration of acetyl sulfisoxazole, blood concentrations approximate those of sulfisoxazole. Following a single 4 gram dose of acetyl sulfisoxazole to healthy volunteers, maximum plasma concentrations of sulfisoxazole ranged from 122 to 282 mcg/mL (mean, 181 mcg/mL) for the pediatric suspension and occurred between 2 and 6 hours postadministration of sulfisoxazole, in a pharmacokinetic study.
来源:DrugBank