Breviscapine, which is mainly composed of breviscapus (af lavone glucuronide), is a well-known bioactive constituentextracted from the traditional Chinese medicine Erigeron breviscapus (Vant.) Hand.-Mazz. Breviscapine is extensively used to treat ischemic cerebrovascular and cardiovascular diseases in China. However, the oral bioavailability of breviscapine was found to be quite poor in rats. To increase its oral bioavailability, Caco-2eells and in situ perfusion method in rats were applied to study the mee...