Nursing care
Methylergonovine: what to check before you give it
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated September 2026
Short answer
Methylergonovine is an ergot alkaloid that causes sustained uterine contraction to control postpartum bleeding, but it also raises blood pressure. Check blood pressure before every dose and hold it in a patient with hypertension, preeclampsia, or known cardiovascular disease.
What it does and why it is prescribed
Methylergonovine works directly on uterine smooth muscle, producing a sustained tetanic contraction rather than the rhythmic contract-relax pattern of labour. That sustained clamp is exactly what stops bleeding from an atonic uterus, which is why it sits in the postpartum haemorrhage protocol alongside oxytocin and carboprost.
It is given after the placenta delivers, usually IM, occasionally orally as a follow-on dose. Because the contraction it produces is prolonged, it is not used before delivery of the placenta or in an ongoing labour, and it has no role in cervical ripening or induction. Its job starts once the uterus needs to stay clamped down, not before.
Nursing considerations before giving it
Take a blood pressure reading before you give the dose. This is the single check that separates methylergonovine from oxytocin: the drug is a vasoconstrictor systemically as well as locally, and it can push blood pressure up sharply. A patient with chronic hypertension, gestational hypertension, or preeclampsia should not receive it.
Confirm the placenta has delivered and review the chart for any cardiovascular history, migraine with aura, or peripheral vascular disease, since ergot alkaloids constrict vessels beyond the uterus too. Have the current blood pressure documented alongside the dose you're about to give, not from an hour earlier.
What to monitor
Recheck blood pressure after administration, on a schedule your unit protocol sets, typically within the first fifteen minutes and again before any repeat dose. Watch for a rise that pushes the patient into hypertensive range, particularly in someone with even borderline pressures beforehand.
Track fundal tone and lochia alongside vital signs; the drug is working if the fundus stays firm and bleeding tapers. Watch for chest pain, headache, or visual changes, which can signal vasospasm rather than simple hypertension and warrant an immediate call to the provider.
Side effects versus adverse effects
Expected side effects include cramping, nausea, and a transient rise in blood pressure that stays within a tolerable range. These are the trade-off for effective uterine tone and don't usually require the dose to be stopped.
Adverse effects are different in kind, not just degree: a hypertensive crisis, seizure, chest pain from coronary vasospasm, or stroke-like symptoms. Any of these is a reason to stop, notify the provider immediately, and treat it as an emergency rather than a side effect to note in the chart.
What to hold for and when to call
Hold the dose if the pre-administration blood pressure is elevated above your facility's threshold, commonly around 140/90 mmHg though local protocols vary, or if the patient has a documented history of hypertension or preeclampsia. Hold for known hypersensitivity to ergot alkaloids as well.
Call the provider before giving it if you find hypertension you weren't expecting, or after giving it if blood pressure climbs, the patient reports a severe headache, or you see any sign of chest pain or visual disturbance. These aren't wait-and-recheck situations.
Patient teaching
Tell the patient to expect cramping stronger than typical afterpains, and that this is the drug working rather than a complication. Explain why you're taking a blood pressure reading before the injection and why you'll check it again afterward.
Ask her to tell you immediately about a severe headache, chest pain, or visual changes in the hours after the dose. If she has a history of high blood pressure that wasn't previously documented, that's worth surfacing before, not after, the next dose is due.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our maternity and newborn practice questions are the closest set to what this page covers.
Common questions
Why is methylergonovine contraindicated in hypertension?
It's a vasoconstrictor systemically, not only in the uterus, so it can raise blood pressure further in a patient who is already hypertensive. In someone with preeclampsia this risks pushing blood pressure into a dangerous range or precipitating seizure, which is why pressure is checked before every dose.
What is the correct route for methylergonovine?
It's most commonly given IM in the immediate postpartum period, with oral tablets used for follow-on dosing. IV administration is avoided outside of specific emergency protocols because of the risk of a sudden, severe hypertensive spike.
How is methylergonovine different from oxytocin?
Oxytocin produces rhythmic contractions and is safe across a wide range of patients including those with hypertension. Methylergonovine produces a sustained tetanic contraction and carries the added risk of raising blood pressure, which is why it's reserved for postpartum use and screened against hypertension first.
What do I do if a patient's blood pressure is high before her methylergonovine dose is due?
Hold the dose and notify the provider rather than giving it and monitoring afterward. An elevated pre-dose pressure is a contraindication, not a reason to watch more closely once the drug is on board.