What Is Eplerenone? Uses, Dosage, and What You Need to Know in 2026

Eplerenone is a prescription heart medication that has been helping patients with high blood pressure and heart failure since the FDA approved it in 2002. If you've been prescribed Eplerenone — or are curious about whether it might be appropriate for you — this guide explains exactly what it is, what it treats, how it works, and what to expect.

What Is Eplerenone?

Eplerenone (brand name Inspra) is a mineralocorticoid receptor antagonist (MRA) — a class of drugs that block the hormone aldosterone. It comes as an oral tablet in two strengths: 25 mg and 50 mg. Eplerenone is not a controlled substance and is available as a generic medication at most pharmacies.

It was originally developed by Pfizer (now marketed generically, with Inspra brand made by Viatris) and was derived from spironolactone, an older aldosterone blocker — but with a key improvement: Eplerenone is far more selective, binding almost exclusively to the mineralocorticoid receptor and avoiding the hormonal side effects that made spironolactone difficult for many patients to tolerate.

What Is Eplerenone Used For?

Eplerenone has two FDA-approved indications:

1. Heart Failure with Reduced Ejection Fraction (HFrEF) After Heart Attack

Eplerenone is FDA-approved to improve survival in stable patients with left ventricular dysfunction (an ejection fraction of 40% or less) and symptoms of heart failure following an acute myocardial infarction (heart attack). This is supported by the landmark EPHESUS clinical trial, which demonstrated significant reductions in all-cause mortality and cardiovascular hospitalizations when Eplerenone was added to standard heart failure treatment.

2. Hypertension (High Blood Pressure)

Eplerenone is also FDA-approved for the treatment of hypertension (high blood pressure), either alone or combined with other antihypertensive medications. It's particularly useful in cases of resistant hypertension (blood pressure that doesn't respond to multiple other medications) and secondary hypertension caused by excess aldosterone (primary aldosteronism).

Off-Label Uses

Doctors sometimes prescribe Eplerenone off-label (outside its approved indications) for chronic heart failure with reduced ejection fraction (without a recent MI), primary aldosteronism, and in some cases for conditions where aldosterone excess plays a role. Off-label use is legal and common in cardiology when clinical evidence supports it.

Eplerenone Dosage: How Much Do You Take?

Your dose depends on what you're treating:

Heart failure after MI: Start at 25 mg once daily, titrate to 50 mg once daily within 4 weeks if tolerated and potassium levels allow

Hypertension: 50 mg once daily; if blood pressure isn't adequately controlled after 4 weeks, can increase to 50 mg twice daily

Doses may need to be reduced if you take moderate CYP3A4 inhibitors (certain antibiotics, antifungals, or heart medications). Your prescriber will determine the right dose based on your situation.

How to Take Eplerenone

Can be taken with or without food

Take at the same time each day for consistent blood levels

Do not take potassium supplements or potassium-containing salt substitutes while on Eplerenone

Avoid grapefruit juice — it increases Eplerenone blood levels by about 25%

Do not stop taking Eplerenone without talking to your doctor first

Who Should NOT Take Eplerenone?

Eplerenone is contraindicated in:

Patients with potassium levels above 5.5 mEq/L

Severe kidney impairment (eGFR <30 mL/min/1.73m² for the heart failure indication)

Patients taking strong CYP3A4 inhibitors (such as ketoconazole, itraconazole, ritonavir, or clarithromycin)

Type 2 diabetics with microalbuminuria (for the hypertension indication specifically)

How Much Does Eplerenone Cost?

Generic Eplerenone is available at most pharmacies. With a GoodRx or SingleCare discount card, the cash price runs $17–$22 per month — a significant reduction from the $90–$145 retail price. Most insurance plans cover it as Tier 1 or Tier 2. For the complete guide on keeping costs low, see our article on how to save money on Eplerenone in 2026.

How to Find Eplerenone at a Pharmacy Near You

Eplerenone is widely available and not in shortage, but individual pharmacies may occasionally be out of stock of a specific strength. Use medfinder to find which pharmacies near you currently have Eplerenone in stock — saving you time and eliminating the need to call multiple pharmacies on your own.