Comparative Pharmacokinetics and Bioavailability of Three Ephedrines in Rat after Oral Administration of Unprocessed and Honey-Fried Ephedra Extract by Response Surface Experimental Design

Figure 1

Chemical structures of EH (a), PEH (b), MEH (c), and IS matrine (d).

(a) Ephedrine

(b) Pseudoephedrine

(c) Methylephedrine

(d) Matrine