It is a drug commonly used in obstetrics and gynecology clinics, the main role is to promote contractions, promote lactation, and lower blood pressure as follows: 1, the smooth muscle of the uterus is sensitive to contraction, which can cause excitation and contraction, and by using a certain dose of contraction during labor, the contraction of the uterus can be increased to shorten the labor process. 2, contraction can also promote the muscle tissue around the mammary gland vesicles to contract and promote the discharge of milk from the ducts. The contraction of the muscle tissue around the mammary vesicles can promote the discharge of milk from the milk ducts. 3, contractions can also cause the relaxation of vascular smooth muscle to play a hypotensive effect. The main side effect of indocin is to cause nausea, vomiting and other gastrointestinal reactions; it can also act on the heart to accelerate the heart rate and may induce arrhythmia; due to improper dosage, it may also cause hypertension and edema, so for patients with a history of heart disease and high blood pressure, the changes in vital signs must be closely monitored during the use.