Climbers in Himalayas use sildenafil all the time to cope with altitude sickness/High Altitude Pulmonary Edema. That could also align with the theory from some

Climbers in Himalayas use sildenafil all the time to cope with altitude sickness/High Altitude Pulmonary Edema. That could also align with the theory from some NYC doctor that COVID-19 requires the same approach as altitude sickness and not ventilators (too much lung damage). Also, Chinese doctors reported that people in "prone positioning" recovered faster. https://www.webmd.com/lung/news/20200407/doctors-puzzle-over-covid19-lung-problems https://www.webmd.com/lung/news/20200407/doctors-puzzle-over...