Yuanhua dose dependently increased the resting tension and the mean contractile amplitude of isolated bladder detrusor muscle strips in guinea pigs.The effect was blacked by verapamil partly.

• 芫花可剂量依赖性增高豚鼠膀胱逼尿肌肌条的张力，增大膀胱逼尿肌肌条的收缩波平均振幅。异搏定可部分阻断芫花增高膀胱肌条张力的作用。