Progesterone is a natural progestin secreted by the corpus luteum of the ovary, which inhibits ovulation by suppressing the secretion of pituitary gonadotropins, thus delaying menstruation, and the medication should be taken under the supervision of a doctor. The medication should be taken under doctor’s supervision. 1, want to delay menstruation, you need to start taking progesterone 5-7 days before menstruation, and keep taking it until you need to let menstruation come. During this period the drug progesterone can maintain the luteal function, but 2-7 days after stopping the drug, it will stimulate the endometrium in the secretory phase of necrosis, exfoliation, resulting in withdrawal bleeding; 2, before taking progesterone to delay menstruation, it is recommended that you go to the hospital to check the blood HCG and ultrasound, to clarify whether you are pregnant. If pregnant, it is necessary to follow the doctor’s advice to use with caution, because synthetic progesterone may have a teratogenic effect on the fetus; 3, long-term use of progesterone may have adverse reactions, such as endocrine disruption, affect ovulation, dizziness, nausea, increase the risk of thrombosis, etc., and therefore is not recommended for long-term use. Progesterone other role of progesterone in addition to delaying the role of menstruation, but also has the role of inhibiting contractions, the role of fetal preservation, so the use of the drug need to comply with the doctor’s instructions to take strictly, do not increase or decrease the drug without authorization, so as not to play the opposite effect.