Wu Ji Bai Feng Wan does not have the effect of inducing menstruation and there is no question of taking it for a few days. Wu Ji Bai Feng Wan is effective in tonifying Qi and blood, regulating menstruation and stopping leucorrhoea (regulating menstruation and reducing abnormally increased leucorrhoea). It is mainly used for the treatment of lumbar and knee soreness (the feeling of soreness and weakness of the waist and knees), irregular menstruation, body thinness, and subluxation of leucorrhoea, which are caused by deficiency of Qi and blood. Among them, menstrual irregularities are specifically characterized by irregular menstrual flow, dysmenorrhea, and metrorrhagia (excessive or spotting menstrual flow). It can be seen that Wu Ji Bai Feng Wan has the effect of regulating menstruation and does not have the effect of inducing menstruation, so there is no question of how many days to take it. If women have abnormal menstrual symptoms, it is recommended to go to a regular hospital, under the guidance of the doctor, to identify the causes and target treatment. At the same time, we should pay attention to maintain a regular work and rest, avoid staying up late; keep in a good mood, avoid emotional fluctuations; appropriate exercise, avoid overwork and so on. If you have any symptoms, please go to the regular hospital in a timely manner under the guidance of a professional physician to use medication, so as not to delay the condition.