阿司匹林预防结直肠癌：起效时间？
第二个稍大剂量药物注射后，因为“备用受体”已经被结合，所以药物的起效时间可以缩短。
The second, much larger dose is then administered and the speed of onset decreased secondary to the "spare" receptors already being bound.
目的：研究各种透皮促进剂对丁卡因经皮渗透的影响，找出一种起效时间较短的丁卡因凝胶剂。
OBJECTIVE: To study the effect of penetration enhancers on the transdermal delivery of tetracaine and find a percutaneous tetracaine formulation with short onset time.
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