Depending on the method of administration of the contraction, the reaction time of pregnant women varies, e.g. the reaction occurs after 3-5 minutes of intra-muscular injection and can occur immediately after intravenous drip. The intravenous drip allows the contractile hormone to reach the body of the uterus quickly with the blood circulation and bind to the contractile hormone receptors in the muscular layer to cause contractions. Therefore, the response is more rapid with intravenous drips than with intramuscular injections. Intramuscular injection of contractile hormone usually lasts 30-60 minutes, whereas the frequency and intensity of uterine contractions stabilize within 15-60 minutes after intravenous drip, and the response gradually decreases 20 minutes after the drip is completed, but the sensitivity of the individual to contractile hormone may also affect the response time. It should be noted that mild adverse reactions may occur with the injection of indocin, including occasional nausea, vomiting, increased heart rate or cardiac arrhythmia, and possible formation of blood clots by intravenous drip, with clinical manifestations varying from individual to individual. The number of drug drops and drug concentration must be strictly controlled to avoid serious consequences.