"Budesonide inhaled via dry powder inhaler, 400 micrograms per inhalation, 2 inhalations twice a day"--STerOids in COVID-19 Study(STOIC), catalogued at clinicaltrials.gov, study #NCT04416399.
I do not know much about inhalers, though, so I am assuming that the dosage is typically found in inhalers prescribed to asthmatics.
Two puffs twice a day is the recommended dosage for my budesonide inhaler. I don’t use it that often, much to the chagrin of my doctors. I tend to be drug sensitive and I’ll use the minimum that gives me relief while sparing me side effects. This isn’t an antibiotic so I don’t see a problem if a lower dose works for me.