Menstrual injection is used when delayed menstruation occurs and has the effect of promoting the shedding of endometrium as well as activating the blood. The normal female menstrual cycle is 28-35 days, if it exceeds 35 days it is called delayed menstruation. Regularly delayed menstruation can cause ovulation disorders or endocrine disorders. Most of the causes of delayed menstruation are low progesterone levels, which cannot make the endometrium necrotic and shed. At this time, it is possible to appropriately supplement exogenous progesterone. Progesterone injections are used for 3-5 angels in a row to fully secrete the endometrium, and menstruation will occur in about 3 days after stopping the drug. The main reason for patients with delayed menstruation is poor blood circulation leading to difficulties in the outflow of menstrual blood. It is possible to use progesterone injection together with motherwort injection intramuscularly, 2 times/day for 3 days to enrich the blood flow of the reproductive system and promote the appearance of menstruation.