Abstract:Objective: To investigate the effect of verapamil on the pharmacokinetics of puerarin in rats. Method: Puerarin with or without verapamil was administered intravenously or orally to rats. The concentration of puerarin in serum was determined by HPLC. Result: No significant difference was found between the control and 0.5 μg·g-1 verapamil combined groups for intravenous administration, and there was significant difference between the control and 2.5 μg·g-1 verapamil combined groups (P<0.05). When puerarin was administered orally with verapamil, significant difference was found between the control and combined groups (P<0.05). Conclusion: Verapamil inhibited puerarin metabolism when puerarin was coadministered with verapamil, so it is necessary to change the therapeutic dose of puerarin.