I stopped using Flonase because it was preserved with benzalkonium chloride. This is a problematic ingredient. It can have adverse effects such as irritation and worsening of your underlying sinusitis. Of course, since the steroid is effective, this can happen without you knowing. This is a probable contributor to the “rebound swelling” people sometimes get when going off of it.
I switched to a generic nasal steroid that is not preserved with this ingredient. It seemed to work better. Unlike flonase, I had no side effects. Unlike flonsase, I also had no rebound swelling when going off of it after different pollen seasons.
BTW, this preservative is used in a bunch of things. It is mostly a problem for products that go in your eyes or nasal passages. Check to be sure your saline isn’t preserved with it either.