It is generally not recommended to artificially interfere with menstruation, if necessary, you can take oral progesterone, dydrogesterone tablets or intramuscular injection of progesterone under the guidance of a doctor, progesterone and dydrogesterone tablets are progestational hormone drugs, occasional use of which does not have a significant impact on the body. After taking progestin drugs, the endometrium can be transformed into a secretory phase to delay menstruation, usually stopping the drug 3-7 days to menstruation. You can calculate the time to start taking them according to your need to delay menstruation. Adverse reactions such as dizziness, drowsiness and breast pain may occur after taking the medicine, which usually do not need to be handled and these symptoms will be relieved after the onset of menstruation. How to delay menstruation and not hurt the body need to take the medicine under the guidance of a doctor, not self-medication, in order to avoid adverse reactions.