Sacubitril-valsartan: what it treats, how to take it, side effects
Last updated September 3, 2026.
Sacubitril-valsartan pairs two mechanisms: valsartan blocks the substances that tighten blood vessels, and sacubitril - a neprilysin inhibitor - helps control blood volume. You may know it as Entresto. It is the modern backbone of heart-failure treatment: fewer hospitalizations, lower risk of death.
What does it treat?
Certain types of heart failure - usually alongside other medications - lowering the risk of death and hospitalization in adults, and treating certain heart failure in children 1 year and older.
How do you take it?
Tablets twice a day, with or without food, same times daily. For those who cannot swallow tablets: sprinkle capsules opened onto 1 to 2 teaspoons of soft food - applesauce, yogurt, pudding - swallowed immediately without chewing (never chew or crush the pellets), or a pharmacist-prepared suspension, shaken well. Continue even when you feel well - heart-failure medications are the feeling-well. Missed dose: take it when you remember unless the next one is close; never double up.
Side effects to know
- Common: cough and extreme tiredness - plus the expected blood-pressure dip: dizziness, especially on standing.
- Serious - call your doctor immediately: the angioedema pattern - rash, itching, swelling of the lips, tongue, face, or throat, and difficulty breathing.
Who should not take it?
Pregnancy is a hard stop: the combination may cause death or serious injury to the fetus in the last 6 months - if you become pregnant, stop it and call your doctor immediately. Anyone who has ever had angioedema - especially on an ACE inhibitor or ARB - belongs in the risk conversation, and ACE inhibitors must be fully cleared first: the switch requires a 36-hour gap between the last ACE-inhibitor dose and the first sacubitril-valsartan dose. Flag kidney or liver disease and low blood pressure. Potassium supplements and salt substitutes are a prescriber decision.
When is it an emergency?
Swelling of the lips, tongue, face, or throat, or any trouble breathing is a 911 call. Fainting is urgent care. For an overdose, call Poison Control at 1-800-222-1222. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Why the 36-hour gap when switching from my old blood-pressure pill?
The ACE-inhibitor washout: ACE inhibitors and sacubitril-valsartan must never overlap, because together they spike the risk of angioedema - sudden, dangerous swelling. The labeled rule is a 36-hour gap between the last ACE-inhibitor dose and the first Entresto dose. The gap is the safety margin, and your prescriber owns the switch calendar.
Why is throat swelling the emergency everyone mentions?
Angioedema: swelling of the lips, tongue, face, or throat that can close the airway - the one side effect of this class that can kill in minutes. It is rare, it can arrive at any point in treatment, and the history question matters: anyone who has had angioedema before, especially on an ACE inhibitor or ARB, is higher risk. Swelling or trouble breathing on this drug is 911, not a phone call.
Why did my doctor say this replaces my old heart-failure pill rather than adds to it?
Because the valsartan half is an ARB - the same family as many older heart-failure blood-pressure drugs - and doubling the mechanism adds risk without benefit. Entresto's evidence earned it the backbone role: in trials it beat the older standard on hospitalizations and survival. The switch is the standard of care moving, not a demotion of your old drug.
Why do I get dizzy standing up?
The drug lowers blood pressure - that is part of how it unloads the failing heart - and the dip is sharpest when you stand. Rise in stages, hydrate, sit back down if it swims. Dizziness that becomes fainting, or dizziness with chest pain or a racing heart, moves from technique to phone call. The first weeks are the peak; most people adapt.
Why did they ask if I might be pregnant?
The pregnancy rule is absolute: the combination may cause death or serious injury to the fetus in the last 6 months of pregnancy - so it is not taken while pregnant, and a pregnancy on it means stop and call immediately. Anyone who could conceive gets the contraception conversation up front, and pregnancy plans mean a medication plan change before conception.
What happens if I miss a dose of sacubitril-valsartan?
Take it as soon as you remember, unless it is almost time for the next one - then skip it and never double up. Heart-failure drugs protect on consistency; the 8-and-8 alarm pair is the standard anchor. If you are missing often, tell your team - the schedule can be worked with, but silent gaps cannot.