The onset of action of oxytocin varies from person to person, depending on the individual’s body type and the site of action. Some pregnant women are not sensitive to oxytocin and are more resistant to it, so the onset of action is slower; some pregnant women are more sensitive to oxytocin and will have an immediate contraction response after oxytocin injection. If oxytocin is injected directly into the cervix, it may take 1-2 minutes to take effect, which can promote uterine contraction and reduce vaginal bleeding. If oxytocin is administered intramuscularly, it may take up to 10 minutes to take effect. If oxytocin is administered intravenously, the onset of action may be faster, and the time to effect varies with the method of administration. However, oxytocin should be administered in small, gradual doses and not in excessive amounts, as this may cause an increase in blood pressure. In addition, in addition to promoting contractions, oxytocin also has the effect of stopping bleeding, so it is necessary to adjust the dosage and route of administration according to the specific situation in the process of use, and use the drug carefully.