If you take Dingkun Dan during menstruation, it may cause excessive menstrual flow and prolong the menstrual period, resulting in disruption of the menstrual cycle. It is recommended to take Dingkun Dan one week before menstruation or after menstruation, and try to take it after meals to reduce the reaction of gastrointestinal tract, and generally stop taking it after six days of continuous use. During menstruation, you should pay attention to eating more food rich in high quality protein, more iron-rich food, more fresh vegetables and fruits to help strengthen resistance and immunity, try to avoid cold food and spicy stimulating food.