# Eplerenone

Eplerenone, sold under the brand name Inspra, is an aldosterone antagonist type of potassium-sparing diuretic that is used to treat chronic heart failure and high blood pressure, particularly for people with resistant hypertension due to elevated aldosterone. It is a steroidal antimineralocorticoid of the spirolactone group and a selective aldosterone receptor antagonist (SARA).

## Medical uses
### Heart failure

Eplerenone reduces risk of death in patients with heart failure, particularly in patients with recent myocardial infarction (heart attack).

### Hypertension

Eplerenone lowers blood pressure in patients with primary hypertension. Eplerenone also reduces arterial stiffness and vascular endothelial dysfunction.
For persons with resistant hypertension, eplerenone is safe and effective for reducing blood pressure, particularly in persons with resistant hypertension due to hyperaldosteronism.

### Central serous chorioretinopathy

Eplerenone is often prescribed for people with central serous chorioretinopathy (CSC). However, the most recent and largest randomized controlled trial showed that eplerenone has no significant effect on chronic CSC that has been untreated for four months. There was one relatively large prospective, interventional case-control study that was tested in acute CSC that showed improved resolution of subretinal fluid in treatment group vs observational group (which is standard of care) with 45% resolution at end of 1st month, 55% at end of 2nd month, and 62% at end of 3rd month (vs 10%, 21%, and 31% in standard of care group). Study also showed faster resolution of visual acuity at the end of each month with 92% and 100% in the first two months vs 74% and 86% with resolution reaching 100% after the third month in standard of care group.

## Adverse effects

Common adverse drug reactions (ADRs) associated with the use of eplerenone include: hyperkalaemia, hypotension, dizziness, and reduced renal clearance. Eplerenone may have a lower incidence than spironolactone of sexual side effects such as feminization, gynecomastia, impotence, low sex drive and reduction of size of male genitalia. This is because other antimineralocorticoids have structural elements of the progesterone molecule, causing progestogenic and antiandrogenic outcomes. When considering taking these medicines, it is important to note the variations in their ability to offset the nongenomic effects of aldosterone.
Currently, there is not enough evidence available from the randomized controlled trials on side effects of eplerenone to do a benefit versus risk assessment in people with primary hypertension.

### Interactions

Eplerenone is primarily metabolized by the cytochrome P450 enzyme CYP3A4. Thus the potential exists for adverse drug interactions with other drugs that induce or inhibit CYP3A4. Specifically, the concomitant use of the CYP3A4 potent inhibitors ketoconazole and itraconazole is contraindicated. Other CYP3A4 inhibitors including erythromycin, saquinavir, and verapamil should be used with caution. Other drugs that increase potassium concentrations may increase the risk of hyperkalemia associated with eplerenone therapy, including salt substitutes, potassium supplements and other potassium-sparing diuretics.

## Pharmacology

Eplerenone is an antimineralocorticoid, or an antagonist of the mineralocorticoid receptor (MR). Eplerenone is also known chemically as 9,11α-epoxy-7α-methoxycarbonyl-3-oxo-17α-pregn-4-ene-21,17-carbolactone and "was derived from spironolactone by the introduction of a 9α,11α-epoxy bridge and by substitution of the 17α-thoacetyl group of spironolactone with a carbomethoxy group." The drug controls high blood pressure by blocking the binding of aldosterone to the mineralocorticoid receptor (MR) in epithelial tissues, such as the kidney. Blocking the action of aldosterone decreases blood volume and lowers blood pressure. It has 10- to 20-fold lower affinity for the MR relative to spironolactone, and is less potent in vivo as an antimineralocorticoid. However, in contrast to spironolactone, eplerenone has little affinity for the androgen, progesterone, and glucocorticoid receptors. It also has more consistently observed non-genomic antimineralocorticoid effects relative to spironolactone (see membrane mineralocorticoid receptor). Eplerenone differs from spironolactone in its extensive metabolism, with a short half-life and inactive metabolites.
Eplerenone seems to be about 50 to 75% as potent as spironolactone as an antimineralocorticoid. Hence, 25 mg/day spironolactone may be equivalent to approximately 50 mg/day eplerenone.

## Society and culture

Eplerenone was patented in 1983 and approved for medical use in the United States in 2002. Eplerenone is approved for sale in Canada, the US, the EU, Netherlands, and Japan.

### Economics

Eplerenone costs an estimated $2.93 per day when treating congestive heart failure and $5.86 per day when treating hypertension.

### Brand names

In the US, Inspra is marketed by Viatris after Upjohn was spun off from Pfizer.