If there are indications for the use of the drug, you can take Wu Ji Bai Feng Wan two days before your menstrual period. Wu Ji Bai Feng Wan consists of Wu Ji, Deer Antler Gel, Turtle shell, Oyster, Cuttlefish, Ginseng, Astragalus, Angelica Sinensis, Paeoniae Alba, Chinese Yam and Gorgon fruit, etc. Its effect is to tonify Qi and nourish blood, regulate menstruation and stop leucorrhoea (regulate menstruation and reduce abnormally increased leucorrhoea), and it is mainly used in treating deficiency of Qi and blood, menstruation irregularities, body thinness, and aching of the waist and knees (a feeling of aching and weakness of waist and knee), and other medical conditions. You can take Wu Ji Bai Feng Wan two days before your menstrual period. The adverse reactions and contraindications of Wu Ji Bai Feng Wan are not clear. Those who usually have normal menstruation and suddenly have scanty menstruation, or staggered menstruation, or irregular vaginal bleeding should go to the hospital for consultation. It should be noted that if patients need to take Wu Ji Bai Feng Wan, it is recommended to take it under the guidance of a doctor to avoid adverse reactions and delays.