How long it takes to drink saffron to expel menstrual blood stasis is related to the patient’s physical condition and menstrual irregularities, which needs to be analyzed on a case-by-case basis and cannot be generalized. Saffron has the function of activating blood circulation and removing blood stasis. Drinking an appropriate amount during menstruation can promote uterine contraction and endometrial shedding, which can improve the low menstrual flow to a certain extent, regulate women’s menstrual irregularities and promote menstrual blood discharge to relieve the symptoms of blood stasis. Some patients may be able to see significant results in 1-2 months, while some may need to persist for about half a year or more, with some individual differences. However, if the patient has a heavy menstrual flow, it is not recommended to drink saffron infused water to avoid the effect of activating the blood and making the menstrual flow more, which may cause anemia or heavy bleeding. It is recommended that before using saffron, patients should visit a Chinese medicine or gynecology department and follow the doctor’s instructions on how to use saffron. You should keep a healthy mind, pay attention to a reasonable diet, eat more fresh fruits and vegetables, and exercise regularly.