After the injection of oxytocin, most pregnant women respond within half an hour or so, and some may take longer, due to individual differences and different concentrations of the drug. In full-term labor, a doctor’s assessment is needed to determine the need for a drip of oxytocin. I.V. contractions are also risky and the principle is to get the best contractions with the smallest concentration. The principle is to obtain the best possible contractions at the lowest possible concentration. It is usually started with a small dose at a low concentration, and the drip rate is also required. Start with 2mU/min, usually the IV drip will respond in half an hour, and then adjusted according to the strength of the contractions. Oxytocin needs to be increased to the point where intrauterine pressure reaches 50-60mmHg during contractions, with contractions occurring 2-3 minutes apart and lasting 40-60 s. To this extent, there is no need to increase the drip rate, and maintaining the existing drip rate is sufficient. Close monitoring of the fetus is necessary during the drip of uterotonin, and any abnormalities need to be dealt with in a timely manner.