NeuroRx Announces ZYESAMI™ (aviptadil, RLF-100) Met the Primary Endpoint of Its Phase 2b/3 Clinical Trial and Also Demonstrated a Meaningful Benefit in Survival from Critical COVID-19 RADNOR, Pa., March 29, 2021 /PRNewswire/ -- NeuroRx, Inc. today reports 60-day results of the Phase 2b/3 trial of intravenously-administered ZYESAMI™ (aviptadil acetate) for the treatment of respiratory failure in critically-ill patients with COVID-19, which is being developed in collaboration with Relief Therapeutics Holding AG (SIX:RLF,OTCQB:RLFTF). Across all patients and sites, ZYESAMI™ met the primary endpoint for successful recovery from respiratory failure at days 28 (P = .014) and 60 (P = .013) and...