Objective To study the metabolic pathways of Epimedin B in rats. Methods Twelve Sprague Dawley rats were classed into 2 groups, corresponding to an intermuscular administration and an oral administration group respectively. Rat feces and urine samples were collected before dose and at 24 h after administration. All samples were pretreated and analyzed by LC-LTQ Orbitrap MSn. Results By comparison between the total ion chromatograms of samples after administration with the samples before dose, the possible m...