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 QD orally, on the reduction of SBP in approximately 300 participants aged ≥ 18 years with HTN (≥ 140 mmHg at Screening; ≥ 135 mmHg at randomisation) despite a stable regimen of 2 antihypertensive agents at baseline, one of which is a diuretic (uHTN); or ≥ 3 antihypertensive agents at baseline, one of which is a diuretic (rHTN).

Inclusion criteria

• Male or female participants must be ≥ 18 years old.
• Mean seated SBP on automated office blood pressure measurement (AOBPM) ≥ 140 mmHg at Screening.
• Fulfil at least 1 of the following 2 criteria:

• uHTN subpopulation: have a stable regimen (≥ 4 weeks) 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.
• rHTN subpopulation: have a stable regimen (≥ 4 weeks) 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.• Mean seated SBP on AOBPM ≥ 135 mmHg at Baseline.

Exclusion criteria

• Mean seated SBP on AOBPM ≥ 170 mmHg.
• Mean seated DBP on AOBPM ≥ 105 mmHg.
• Serum sodium level (Na+) < 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.
• NYHA functional heart failure class IV at Screening.