Oxytocin

Uterotonic (Posterior Pituitary Hormone)

Drug Class: Uterotonic (Posterior Pituitary Hormone)
Mechanism of Action (MOA): Activates uterine oxytocin receptors → rhythmic myometrial contraction; also drives milk letdown.
Clinical Notes: Labor induction/augmentation and first-line for postpartum hemorrhage. Watch uterine tachysystole/rupture and fetal distress; hyponatremia (ADH-like effect) with prolonged high-dose infusion.
Source: FDA label (DailyMed)