History of hospitalization because of COVID-19 Participate in any other clinical trial for the treatment of COVID-19 Patients under mechanical ventilation at the baseline Bradycardia Sensitivity to Atazanavir Active cancer Immune deficiency or immune compromised Baseline abnormal ECG Pregnancy and lactation Renal impairment (CLcr<50 mL/min) Severe hepatic impairment (Child-pough C) Multi organ failure Concomitant use of rifampin, carbamazepine, phenytoin

History of hospitalization because of COVID-19 Participate in any other clinical trial for the treatment of COVID-19 Patients under mechanical ventilation at the baseline Bradycardia Sensitivity to Atazanavir Active cancer Immune deficiency or immune compromised Baseline abnormal ECG Pregnancy and lactation Renal impairment (CLcr<50 mL/min) Severe hepatic impairment (Child-pough C) Multi organ failure Concomitant use of rifampin, carbamazepine, phenytoin