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The first randomized controlled trial of an ARB for treatment of COVID-19 returned preliminary results showing possible improvements in time to discharge, need for supplementary oxygen and CRP. See "Telmisartan for treatment of Covid-19 patients: an open randomized clinical trial. Preliminary report." See independent critical appraisal of trial.

List of Angiotensin-receptor blocker (ARB) trials for COVID-19:

ACE inhibitor trials:

Other trials of renin-angiotensin modulation for COVID-19:

C21, an AT2R agonist, has shown benefit in animal lung injury models, similar to ARBs. In a recent randomized, placebo-controlled clinical trial, C21 showed promise as COVID-19 treatment. Photo CC-BY Rathinasabapathy, et al.
While not a trial of ARBs as therapy, BRACE CORONA was a randomized controlled trial exploring stopping-versus-continuing ACE inhibitors/ARBs in patients with hypertension. It showed no harm in continuation of ACE inhibitors and ARBs with COVID-19. There was a non-statistically significant hint of a benefit in the ACEi/ARB group but the trial was not powered to detect this.

See also

The first randomized controlled trial of an ARB for treatment of COVID-19 returned preliminary results showing possible improvements in time to discharge, need for supplementary oxygen and CRP. See "Telmisartan for treatment of Covid-19 patients: an open randomized clinical trial. Preliminary report." See independent critical appraisal of trial.

List of Angiotensin-receptor blocker (ARB) trials for COVID-19:

ACE inhibitor trials:

While not a trial of ARBs as therapy, BRACE CORONA was a randomized controlled trial exploring stopping-versus-continuing ACE inhibitors/ARBs in patients with hypertension. It showed no harm in continuation of ACE inhibitors and ARBs with COVID-19. There was a non-statistically significant hint of a benefit in the ACEi/ARB group but the trial was not powered to detect this.

Other trials of renin-angiotensin modulation for COVID-19:

In a double-blind, randomized, placebo-controlled trial, AT2R agonist C21, one patient in the C21 group required supplementary oxygen at day 14 versus 11 patients in the placebo group (p=0.003). 
C21, an AT2R agonist, has shown benefit in animal lung injury models, similar to ARBs. In a recent randomized, placebo-controlled clinical trial, C21 showed promise as COVID-19 treatment. Photo CC-BY Rathinasabapathy, et al.

See also