Menorrhagia caused by the emergency contraceptive pill is generally reversible, usually for 1-6 months, and will recover on its own after stopping the pill, or can be regulated with some Chinese herbs. Emergency contraceptive pills are not required to be used particularly often, but only in emergency situations and not more than 2 times a month. For women with irregular menstruation, it is better not to use emergency contraceptive pills. This is because the pill suppresses the function of the hypothalamus and inhibits ovulation. In addition, it changes the nature of the cervical mucus, the function and shape of the endometrium, and the function of the fallopian tubes, which are used to achieve the purpose of contraception. Therefore, the contraceptive pill should be used with caution in women with irregular periods. For some women with endocrine disorders, short-acting contraceptives can be used to regulate menstruation. The short-acting contraceptives are Dayum, Eusebio and Mafron; for women with polycystic ovary syndrome and hyperandrogenic symptoms, short-acting contraceptives can be used to regulate menstruation after regular treatment.