There are a lot of menstrual stimulants in pharmacies, but do not use some menstrual stimulants randomly, as this will disrupt endocrine secretion and endocrine disruption will easily occur. Common menstrual stimulants, including progesterone capsules, progesterone pills, progesterone injections and drospirenone tablets and so on, will appear in about 3-5 days after taking them. During the premenstrual period, women are in the luteal phase, and only when they secrete enough luteinizing hormone can they promote the growth of the endometrium. Common herbal medicines to promote menstruation include Yimoucao granules, menstrual regulating Yimou tablets and so on. Chinese herbs are safer and have fewer side effects on the human body, but they are slower to work and are not routinely recommended.