Most of the pain starts after 24 to 48 hours after the induction of labor injection, but the time will vary for each person’s body type. Induction of labor injection is also known as the injection of pregnant women with drugs such as isacridine injection, under the action of which the number and strength of contractions are accelerated, so that the placenta is detached from the wall of the uterus. Under normal circumstances after 24 to 48 hours after the drug injection, pain will begin to appear, the longest will not exceed 72 hours, but each person’s body tolerance, sensitivity are different, so the time is not completely fixed. Some women with high sensitivity will start to feel pain after a few hours of drug injection, while others need to wait until 24 hours to have a reaction, if it is more than 3 days and still no pain, it means that the drug injection fails to need to use the drug again or change the abortion method. Induced abortion injection is also a certain risk, it is recommended to follow the instructions of the doctor to do a good job of observation and care.