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Oxytocin used as medication is a synthetic form of the natural human hormone oxytocin produced by the hypothalamus region in the brain and secreted into the bloodstream by the pituitary gland. Oxytocin is used to induce or improve uterine contractions during delivery and to prevent uncontrolled bleeding (hemorrhage) after the delivery. Oxytocin may also be used to eliminate the uterine contents after a spontaneous or induced termination of pregnancy. Oxytocin is naturally secreted by the body to produce uterine contractions during childbirth, and synthetic oxytocin works likewise. Oxytocin works on positive feedback. The release of oxytocin causes uterine contractions, which in turn, cause more oxytocin to be released, increasing the intensity and frequency of contractions, enabling a vaginal delivery. Oxytocin binds to oxytocin receptors in the uterine muscle wall (myometrium) and stimulates contraction by increasing influx of calcium ions in the uterine muscle cells. Oxytocin receptor concentration normally increases during pregnancy, with levels peaking at term when labor starts. The response to oxytocin varies between individuals depending on the concentration of oxytocin receptors in the uterus. Oxytocin also causes contraction of the myoepithelial cells in the breasts, which helps eject the milk out. The baby’s attempt to suck sends positive feedback, which in turn stimulates oxytocin release and milk output. Oxytocin also has antidiuretic and vasodilatory effects, increasing fluid balance and improving blood flow. In the brain, oxytocin acts as a neurotransmitter and plays an important role in human behaviors including romantic attachment, sexual arousal, trust, mother-child and other relationship bonding. Oxytocin is approved for use in induction of labor in pregnant women at term or near term in certain circumstances:

Recent studies have refined rather than fundamentally changed the current understanding of monogamy. A 2025 study showed that monogamy influences reproductive investment in animal models, supporting the concept that mating systems leave measurable evolutionary signatures. Earlier studies published in 2024 identified epigenetic changes associated with pair bonding instead of a single biological mechanism underlying monogamy. A study published in Scientific Reports used seed beetles to show that monogamy influences investment in reproductive tissues under intense sexual selection, providing further insight into the evolutionary costs and benefits of monogamy across species. Together, these animal studies help researchers identify the evolutionary pressures that shape pair-bonding systems, while highlighting that such findings cannot be directly applied to humans. Rather, they provide insights into how pair bonding evolves across species.