Oxytocin
Oxytocin (Oxt) is a peptide hormone and neuropeptide. Oxytocin is normally produced by the paraventricular nucleus of the hypothalamus and released by the posterior pituitary. It plays a role in social bonding, sexual reproduction, childbirth, and the period after childbirth. Oxytocin is released into the bloodstream as a hormone in response to stretching of the cervix and uterus during labor and with stimulation of the nipples from breastfeeding. This helps with birth, bonding with the baby, and milk production. Oxytocin was discovered by Henry Dale in 1906. Its molecular structure was determined in 1952. Oxytocin is also used as a medication to facilitate childbirth.
Carbetocin
Carbetocin (INN, BAN) (brand names Duratocin, Pabal, Lonactene, Depotocin, Comoton, Decomoton), or 1-butanoic acid-2-(O-methy--tyrosine)-1-carbaoxytocin, is an oxytocic used in obstetrics to control postpartum hemorrhage and bleeding after giving birth, particularly following Cesarean section. It is an eight amino acid long analogue of oxytocin (a nonapeptide) and has a similar mechanism of action. Carbetocin is an agonist at peripherally expressed oxytocin receptors. It is manufactured by Ferring Pharmaceuticals and is available in Canada and the United Kingdom and many other countries throughout the world, but not in the United States.