After the water breaks to play oxytocin injection after how long can be born from person to person, due to the sensitivity of each person to the drug is different and their own physical differences, the effect of the drug time to make a difference, generally in the oxytocin injection after 12 to 24 hours the baby can be born. The injection of oxytocin after the water breaks can strengthen the contractions of the pregnant woman, help her deliver the fetus, and reduce the time the fetus stays in the uterus. Some pregnant women who are injected with oxytocin after their water breaks can quickly feel the contractions intensify, the frequency of abdominal pain increases, and the time of labor is advanced. While some pregnant women are not sensitive to hysterotonin, 2 hours after the injection of drugs will take effect or even no effect, the delivery time will be delayed. Generally after the water breaks the oxytocic injection after 12 to 24 hours after the baby can be born, 24 hours after the baby is not yet born should immediately consult a doctor, under the guidance of the doctor to carry out the formal treatment, to avoid the use of excessive amounts of uterotonin, the use of improper use of uterotonin will cause the maternal uterine rupture, the risk of intrauterine ischemia, hypoxia and other risks to the fetus. The medication should be administered under medical supervision to avoid adverse effects.