If the menstrual period suddenly becomes less is not recommended to take Wu Ji Bai Feng Wan, must rule out the possibility of pregnancy, because some people are pregnant, but when the time to menstruation and a small amount of vaginal bleeding, so mistaken for menstrual decrease, in fact, is already pregnant with miscarriage or ectopic pregnancy caused by the first sign of abortion, in this case do not take Wu Ji Bai Feng Wan, must be investigated to find out the cause. If the menstrual period has been relatively small, this situation can take Wu Ji Bai Feng Wan to give appropriate regulation. Wu Ji Bai Feng Wan in the clinical treatment of menstrual disorders, lumbar and knee soreness, yellowish face and other corresponding symptoms, you can use Wu Ji Bai Feng Wan can be adjusted, and it is best to use the drug under the guidance of the doctor. If there is still no improvement in the menstrual period after half a month of continuous use of the medicine, it is recommended to go to the hospital for examination before deciding on the use of medication.