Delaying menstruation is commonly done by taking oral progestogens such as progesterone capsules and dydrogesterone, or by taking short-acting contraceptives such as mafranil and eosinophil. Delaying menstruation is generally not recommended to avoid side effects. Taking medications can also lead to abnormal menstruation and symptoms such as nausea, vomiting, and fatigue. Taking medication for too long may lead to endometrial hyperplasia, lower abdominal pain, irregular vaginal bleeding and so on. Taking drugs to delay menstruation also have time limitations, oral progestins are usually recommended in the 15th day of menstruation on the beginning of the drug, adhere to the service to want to menstruation when stopping the drug, can not miss a dose, there is a leakage of the dose may be menstruation early. Normal in 3-7 days after stopping the drug will come to menstruation, specific to each person there is a big difference, so with which kind of drug, the specific amount of drugs, the number of times, before taking the drug must be under the guidance of the doctor to use the drug.