Atosiban is a synthetic peptide analogue of oxytocin, a naturally occurring hormone involved in uterine contractions during labor. Structurally, atosiban is a nonapeptide composed of nine amino acids. It is specifically designed to act as a competitive antagonist at the oxytocin receptor, blocking the binding of oxytocin and preventing its stimulatory effects on uterine smooth muscle.Atosiban is primarily used as a tocolytic agent to inhibit premature labor and delay preterm birth. It works by relaxing uterine smooth muscle and reducing the frequency and intensity of contractions, thereby delaying the progression of labor. Atosiban is typically administered intravenously and is indicated for use in pregnant women with established preterm labor between 24 and 33 weeks of gestation
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