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• Summary on chemical compositions and their pharmacological effects of Leonurus japonicus. • Abundant terpenoids and alkaloids are closely related to traditional efficacy of L. japonicus. • Alkaloids show remarkable effects on gynecological and cerebral-cardio vascular diseases. • Many Chinese patent medicines made by L. japonicus have been used in clinic in China. Leonurus japonicus Houtt. is a traditional medicinal herb with significant effects; dating back more than 1800 years, it is widely used in Asia. In traditional Chinese medicine, it is essential in the treatment of menstrual and delivery disorders caused by blood stasis, such as dysmenorrhea, amenorrhea, and postpartum hemorrhage. In the last three decades, many phytochemists, pharmacologists, and doctors have focused on the chemical components, pharmacological activities, and clinical applications of L. japonicus. More than 280 chemical compounds have been isolated from this plant. The effects of most of the terpenoids and alkaloids isolated from the plant have been found to be closely related to the traditional functions of L. japonicus. Owing to its excellent therapeutic effects for obstetrical and gynecological diseases, L. japonicus has been widely used in both ancient and modern times. Nowadays, it has also been developed into a series of Chinese patent medicines in clinics in China. This review summarizes the phytochemistry, pharmacology, and clinical applications of L. japonicus. [ABSTRACT FROM AUTHOR]