How do fluticasone propionate and formoterol work in the lungs?

In Flutiform, inhaled fluticasone propionate is a corticosteroid that reduces lung inflammation, asthma symptoms and exacerbations, while formoterol fumarate is a selective, long-acting β2 adrenergic receptor agonist that widens airways locally, acting within 1–3 minutes and lasting at least 12 hours after a single dose.