A Study to Investigate the Efficacy and Safety of Baxdrostat in Participants With Uncontrolled Hypertension on Two or More Medications Including Participants With Resistant Hypertension

This is a Phase III, multicentre, randomised, double-blinded, placebo-controlled, parallel group study to evaluate the safety, tolerability and effect of 1 or 2 mg baxdrostat versus placebo, administered once daily (QD) orally, on the reduction of systolic blood pressure in approximately 720 participants aged ≥ 18 years with hypertension, despite a stable regimen of 2 antihypertensive agents at baseline, one of which is a diuretic (uncontrolled hypertension); or ≥ 3 antihypertensive agents at baseline, one of which is a diuretic (treatment-resistant hypertension).

Inclusion Criteria: * Male or female participants must be ≥ 18 years old * Mean sitting systolic blood pressure on automated office blood pressure measurement ≥ 140 mmHg and \< 170 mmHg at Screening * Fulfil at least 1 of the following 2 criteria: 1. uHTN subpopulation: have a stable regimen of 2 antihypertensive medications, from different therapeutic classes (at least one must be a diuretic), at maximum tolerated dose in the judgement of the Investigator 2. rHTN subpopulation: have a stable regimen of ≥ 3 antihypertensive medications, from different therapeutic classes (at least one must be a diuretic), at maximum tolerated dose in the judgement of the Investigator * Estimated glomerular filtration rate ≥ 45 mL/min/1.73m2 at Screening * Serum potassium (K+) level ≥ 3.5 and \< 5.0 mmol/L at Screening * Randomisation Criterion: * Sitting systolic blood pressure on attended automated office blood pressure measurement of ≥ 135 mmHg at the Baseline Visit Exclusion Criteria: * Mean sitting systolic blood pressure on attended automated office blood pressure measurement ≥ 170 mmHg * Mean seated diastolic blood pressure on attended automated office blood pressure measurement ≥ 110 mmHg * Serum sodium level \< 135 mmol/L at Screening * Has the following known secondary causes of hypertension: renal artery stenosis, uncontrolled or untreated hyperthyroidism, uncontrolled or untreated hypothyroidism, pheochromocytoma, Cushing's syndrome, aortic coarctation * New York Heart Association functional heart failure class IV at Screening * Persistent atrial fibrillation