Previous studies reported multiple blood concentration peaks in the alkaloid PK and attributed it to the distribution, reabsorption, enterohepatic circulation or the administered drugs having been in a complex prescription [21], [22] and [23]. Other studies have demonstrated that TCMs and natural components from TCMs can be identified as inhibitors, substrates, and/or inducers of a variety of CYP enzymes, and TCMs-CYP interactions may occur and affect the pharmacokinetics [23]. The results also indicated that the absorption of the seven alkaloids and two phenolic acids might be rapid with the Tmax values within 2 h.