You should not take Wu Ji Bai Feng Pills during menstruation, as it will lead to increased menstrual flow. It can be taken between the time your period clears and before your next period. Wu Ji Bai Feng Wan is used for the treatment of lumbar and knee soreness (a feeling of soreness and weakness in the waist and knees), deficiency of qi and blood, irregular menstruation, leucorrhoea, and thinness of the body. It has the effect of regulating menstruation and stopping leucorrhoea, tonifying Qi and nourishing Blood. This medicine is a tonic, take before meals to facilitate the absorption of drugs and better play a role in the efficacy of the drug. During the medication period, pay attention to the regularity of life and work, usually pay attention to keep warm, keep in a happy mood, pay attention to observe their own signs. You need to use the medication under the guidance of a doctor, not blindly self-medication, in order to avoid adverse effects. If the symptoms are not relieved after 1 month of taking the medicine, you should go to the hospital in time.