West Texas MD Richard Bartlett uses nebulized (inhaled) corticosteroid Budesonide to treat Covid-19:
https://youtu.be/eDSDdwN2Xcg
Interview here w/ Letter to Senate & initial paper by Dr. Bartlett:
Dr. Richard Bartlett Shares Covid Information (Update with PDF Links)
“… other organizations and nations are reviewing inhaled Budesonide to treat COVID-19. Inhaled Budesonide is currently under study at the NIH and is also undergoing study in France. Spain and Oxford University have both, individually, announced plans to study inhaled Budesonide as a COVID-19 therapy. […]
Taiwan, a nation of 24 million, treats early with a different inhaled corticosteroid and has had only seven deaths over the duration of this pandemic. Or consider Japan, who also treated with an inhaled corticosteroid. Although Japan’s demographics skew towards an older population, they have had only 977 deaths in a nation of 121 million. Likewise, consider South Korea with population of 50 million who recorded only 283 deaths using an inhaled corticosteroid.”
Formoterol and Budesonide Inhibit Rhinovirus Infection and Cytokine Production in Primary Cultures of Human Tracheal Epithelial Cells – PubMed
https://pubmed.ncbi.nlm.nih.gov/24998372/
Then there is this opinion, but it was written back in May:
https://www.medpagetoday.com/blogs/skeptical-cardiologist/86521
And there is this:
Researchers at UW-Madison published a study that seams to indicate that allergy induced asthma may have protective effects, summary here: https://www.med.wisc.edu/news-and-events/2020/april/allergies-asthma-may-reduce-covid-19-risk-/
Studies need to separate the types/causes and severity of asthma.
In conclusion more research is required. Ongoing studies continue at this time. There may be something here since asthmatics who use nebulized steroids for their asthma saw better outcomes with covid-19. But don’t self-medicate prophylactically, there may be side effects. Discuss it w/ your doctor first.