Carbetocin is a synthetic oxytocin analogue that is longer acting than oxytocin. It has a half-life of 40 minutes compared to 4-10 minutes for oxytocin. Studies show carbetocin is as effective or more effective than oxytocin in preventing postpartum hemorrhage following both vaginal and cesarean deliveries. It requires only a single dose rather than continuous infusion and does not cause uterine receptor desensitization like oxytocin. The WHO recommends carbetocin as an effective first-line uterotonic for preventing excessive bleeding after childbirth.