Double-Blind Randomized Phase 3 Study Comparing Esaxerenone (CS-3150) and Eplerenone in Patients With Essential Hypertension (ESAX-HTN Study)

Mineralocorticoid receptors (MRs) are implicated in the pathology of hypertension. MR blockers are recommended for the treatment of salt-sensitive or resistant hypertension. However, use of currently available MR blockers is limited by adverse events. This phase 3 multicenter, randomized, double-blind study compared the efficacy and safety of esaxerenone, a new selective nonsteroidal MR blocker, at 2.5 and 5 mg/day and eplerenone 50 mg/day in Japanese patients with essential hypertension. After a 4-week washout period, 1001 eligible adults with hypertension were randomized evenly to esaxerenone 2.5 or 5 mg/day or eplerenone 50 mg/day treatments, taken orally once daily for 12 weeks. Primary end points were changes in sitting systolic or diastolic blood pressure (BP) from baseline at the end of treatment. Esaxerenone 2.5 mg/day was noninferior to eplerenone for reductions in sitting and 24-hour BP. Reductions in BP with esaxerenone 5 mg/day were significantly greater than those with esaxerenone 2.5 mg/day. Changes in diurnal BP showed persistent 24-hour antihypertensive effects in all treatment groups. The proportions of patients achieving target sitting BP ( Clinical Trial Registration— URL: http://www.clinicaltrials.gov . Unique identifier: NCT02890173.