The oxytocin is usually given after the placenta has been delivered and not before because it helps to stop postpartum bleeding.
Postpartum hemorrhage it bleeding occurs immediately after the third stage of labor which is after the delivery of placenta.
The administration of oxytocin through the intravenously helps to provide a bolus dose few hours or immediately after delivery of placenta to help in the contraction of the blood vessels of the womb thereby arresting bleeding.
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