Patients do not take Daying-35 menstruation, mostly due to patients taking the drug for too long, resulting in the hypothalamus and pituitary gland function is blocked will cause women do not menstruate, such cases can be discontinued after 7 days on the 8th day to take the second box of drugs. If menstruation does not occur for 2 consecutive months after stopping the medication, the patient can take progesterone, stop the medication and wait for menstruation, or the patient can take other contraceptives to achieve the purpose of contraception. If you need to take Dayin-35 for the treatment of polycystic ovary syndrome and do not have a period after stopping the drug, you should go to the hospital for further examination, which may be caused by endometrial lesions, and damage to the endometrium may also lead to the absence of menstruation after stopping the drug.