A labor injection is a direct intravenous injection of hysteronin to induce and stimulate uterine contractions, which usually takes 1 to 3 days to deliver, but some pregnant women take longer. Not every pregnancy will induce regular uterine contractions and labor episodes after the intravenous administration of oxytocin. The duration of labor is related to the condition of the cervix, sensitivity to oxytocin, the frequency of delivery, the size of the fetus, the week of pregnancy, and the entry of the preterm labor into the pelvis. Usually, pregnant women with good cervical condition, sensitivity to oxytocin, normal fetus, full-term pregnancy, prelabor in the pelvis, and women who have experienced labor may have a normal labor on the same day; while pregnant women with other conditions may need 1 to 3 days or even longer. The dosage and the control process of using the injection must be careful, otherwise it may cause strong uterine contractions, resulting in the fetus suffocating in the uterus without oxygen. Therefore, if a pregnant woman wants to have an intravenous injection of oxytocin, she needs to be closely monitored by a medical professional to avoid unauthorized use of the drug, which may cause adverse effects.