Entresto is not a blood pressure medicine. It is FDA-approved specifically to treat chronic heart failure, not high blood pressure. However, it does lower blood pressure as part of how it works, which is why the question comes up so often. If your doctor prescribed Entresto, it was almost certainly for heart failure, not hypertension.
What Entresto Is Actually For
The FDA has approved Entresto for two uses: reducing the risk of cardiovascular death and hospitalization in adults with chronic heart failure, and treating symptomatic heart failure in children one year and older. The benefits are strongest in patients whose heart doesn’t pump as forcefully as it should, a condition doctors measure using ejection fraction.
Entresto is not listed in major clinical guidelines as a treatment for high blood pressure on its own. There are well-established, less expensive drug classes for that purpose. Entresto fills a different role: helping a weakened heart work more efficiently and keeping patients out of the hospital.
Why It Lowers Blood Pressure Anyway
Entresto combines two active ingredients that each affect blood pressure through different pathways. One component (valsartan) blocks a hormone that tightens blood vessels and raises blood pressure. The other (sacubitril) prevents the breakdown of natural proteins your body uses to relax blood vessels and shed excess sodium and fluid. Together, they open up blood vessels and reduce fluid volume, which inevitably brings blood pressure down.
Interestingly, sacubitril wouldn’t work well on its own. The enzyme it blocks also breaks down substances that constrict blood vessels. Without the second component to counteract that effect, the blood pressure benefits would cancel themselves out. The combination is what makes the drug effective for heart failure.
How Much It Drops Blood Pressure
The blood pressure lowering effect is significant enough to cause problems for some patients. In the landmark trial comparing Entresto to a standard heart failure drug (enalapril), 14% of patients on Entresto experienced symptomatic low blood pressure, compared to 9.2% on enalapril. A real-world study found postural hypotension, the dizzy or lightheaded feeling when standing up, affected about 13% of patients and was one of the most common reasons people had to stop taking the medication.
This is a key distinction. For someone with high blood pressure, lowering it is the goal. For someone with heart failure, blood pressure often runs low to begin with. The blood pressure drop from Entresto is essentially a side effect that needs to be managed, not the reason for taking it.
How Dosing Accounts for Blood Pressure
Doctors typically start Entresto at a lower dose and gradually increase it over several weeks, partly to watch how your blood pressure responds. The usual starting dose is 49/51 mg twice daily. For people who haven’t been on similar medications before, or whose blood pressure already sits on the lower side (systolic around 100 to 110), the starting dose drops even further to 24/26 mg twice daily. The same lower starting dose applies to patients 75 and older.
The target is 97/103 mg twice daily, and the dose is typically doubled every two to four weeks as long as blood pressure stays stable. Some people never reach the full dose because their blood pressure can’t tolerate it.
Important Safety Considerations
If you’re switching to Entresto from an ACE inhibitor (a common class of blood pressure and heart failure drugs), you need to stop the ACE inhibitor and wait at least 36 hours before starting Entresto. Taking them together, or switching too quickly, raises the risk of angioedema, a serious swelling reaction that can affect the face, throat, and airways. Entresto should also never be taken alongside an ACE inhibitor for the same reason.
People who have had angioedema from a previous ACE inhibitor or ARB should not take Entresto. Kidney function can also decline on the medication. In one real-world study, kidney problems and postural hypotension were the two most frequent side effects, each affecting roughly 13% of patients. Among those who ultimately stopped taking Entresto, kidney impairment was the leading cause (41%), followed by headache or dizziness (23.5%) and low blood pressure (17.6%).
If You Were Prescribed Entresto
Your prescription is for heart failure management, even if you also happen to have high blood pressure. Entresto will lower your blood pressure, but that’s not its primary job. Its purpose is to reduce strain on your heart, help it pump more effectively, and lower your chances of being hospitalized or dying from heart failure. If controlling blood pressure were the only goal, there are simpler, cheaper medications designed for that. Entresto solves a more specific and serious problem.