What inhaler side effects have you had that concerned you? Did your doctor switch drug?
I realize the drugs affect muscles and relax and open up airways. Since on Trelegy I've seemed to have a slightly faster respiration. And at times some slight discomfort under sternum or sides of ribs, back. Not right after taking the drug but mid-afternoon maybe. The first 2 days I had some sharp little pains and mucus - not much, not frequent - and that stopped.