Nitric oxide has been found to improve blood flow in areas of the lungs still receiving air, increasing the amount of oxygen in the blood stream.
Along with being used to treat failing lungs, nitric oxide has been found to have antiviral properties against coronaviruses. That was shown during the 2002 to 2003 severe acute respiratory syndrome (SARS) outbreak, which was caused by a coronavirus similar to the one that causes COVID-19.
