Oxytocin — Induction & Administration
Oxytocin is the only drug where the nurse titrates the dose to achieve contractions — but too much too fast turns a routine induction into an emergency. Knowing the protocol is non-negotiable.
Core Concept
Oxytocin (Pitocin) is a synthetic form of the posterior pituitary hormone that stimulates uterine smooth muscle contraction by increasing intracellular calcium. It is indicated for labor induction (post-term pregnancy, PROM without spontaneous labor, medical necessity) and augmentation of inadequate contractions. Administration is always IV via an infusion pump on a secondary line piggybacked into the primary line at the port closest to the patient — this allows immediate discontinuation without losing IV access. The starting dose is low, typically 0.5–2 milliunits/min, and is titrated upward in increments of 1–2 milliunits/min every 15–30 minutes until an adequate contraction pattern is established: contractions every 2–3 minutes, lasting 40–60 seconds, with moderate intensity. Continuous electronic fetal monitoring is required throughout the infusion. The goal is a pattern that mimics physiologic labor, not maximal stimulation. Because oxytocin has a short half-life of 3–5 minutes, stopping the infusion produces rapid decline in uterine activity — this is the safety advantage of IV delivery over other routes. Bishop score of 6 or greater suggests a favorable cervix and better induction success; cervical ripening agents (e.g., misoprostol, dinoprostone) may precede oxytocin when the score is low.
Watch Out For
Don't confuse oxytocin induction with augmentation — induction starts labor from zero; augmentation strengthens an already-established but inadequate pattern. Students mix up the piggyback setup: oxytocin goes on the secondary line at the port closest to the patient, not the primary bag. The half-life of 3–5 minutes is short, which is why stopping the drip is the first intervention for complications — content covered in the sibling complications atom.
Clinical Pearl
Pitocin rides piggyback, never primary. Secondary line, proximal port, infusion pump — always. If something goes wrong, you stop the Pitocin and the main line keeps running.
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