Lorundrostat is a selective aldosterone synthase inhibitor developed by Mineralys Therapeutics (Radnor, PA) with a published selectivity ratio of approximately 374:1 for CYP11B2 (aldosterone synthase) over CYP11B1 (cortisol synthesis). This is 3-4 fold more selective than baxdrostat (approximately 100:1), which should translate to lower cortisol-axis interference if the in vitro selectivity holds in vivo.
Three positive trials in hand. Target-HTN Phase 2 (Laffin 2023 JAMA), Advance-HTN Phase 2 (Laffin 2025 NEJM), and Launch-HTN Phase 3 (Saxena 2025 JAMA, n=1083). Launch-HTN is the largest single-trial dataset for any new HTN agent in this cycle and represents the most mature evidence package among the novel ASi class.
Launch-HTN Phase 3 — the headline result. N=1083 patients on 2-5 background drugs. Pooled 50 mg lorundrostat group reduced office SBP by −16.9 mmHg vs −7.9 mmHg placebo at week 6, for a placebo-corrected SBP reduction of −9.1 mmHg (95% CI −13.3 to −4.9, P<0.001). Effect size on office SBP is similar to baxdrostat BaxHTN (approximately −9 mmHg).
Advance-HTN Phase 2 — the 24-h ABPM proof. N=285 with 24-h ABPM as primary endpoint, double-blind, run-in to exclude pseudoresistance. Placebo-corrected 24-h SBP reduction −7.9 mmHg (stable 50 mg) and −6.5 mmHg (dose-adjusted up to 100 mg) at week 12. ABPM is the gold standard — this is the cleanest BP signal in the lorundrostat program.
Target-HTN Phase 2 dose-finding established 50 mg as the right dose. N=200 (163 with suppressed renin + 37 with non-suppressed renin). Dose-ranging found 50 mg once daily had the best efficacy/safety balance, with placebo-corrected SBP −9.6 mmHg. The 100 mg dose did not give meaningfully better BP lowering but increased the hyperkalemia signal — same dose-response pattern seen in baxdrostat BrigHTN.
Hyperkalemia signal is real but smaller than baxdrostat in CKD. In Target-HTN, 6 of 200 patients had K+ >6.0 mmol/L that corrected with dose reduction or discontinuation. In Advance-HTN, 5% (stable 50 mg) and 7% (dose-adjusted) had K+ >6.0. In Launch-HTN, hyperkalemia discontinuation rates were very low (approximately 0.4%). No CKD-specific Phase 2 (yet) — the BAX-CKD style signal of 41% hyperkalemia in advanced CKD has no equivalent lorundrostat trial. This is a knowledge gap for nephrology.
No hard outcome trials. No HF trials. No DKD trials. Same gap as baxdrostat. The cardiorenal hypothesis for the ASi class rests on extrapolation from MRA evidence (FIDELIO-DKD, FIGARO-DKD, FINEARTS-HF), not lorundrostat-specific outcome data.
Lorundrostat is the most “complete” Phase 3 ASi package right now. Three trials, larger N, NEJM and JAMA pivotal publications, and a selectivity ratio that beats baxdrostat on paper. The clinically meaningful difference between lorundrostat and baxdrostat is genuinely small based on current data — both lower SBP by approximately 8-9 mmHg placebo-corrected, both have a hyperkalemia signal, both lack hard outcome data. Where they diverge is the CKD safety database: baxdrostat has BAX-CKD with the worrying 41% hyperkalemia rate; lorundrostat does not have an equivalent CKD-specific trial. Reasonable people can read this as either “lorundrostat is safer in CKD” or “lorundrostat just hasn’t been stressed yet.” The honest answer is the second one.