Flonase: Topical nasal steroid sprays like Flonase have near negligible absorption in your system (ie blood). Blood levels of any nasal steroid is far below any oral steroid dosing a doctor would give. Topically within the nasal cavity Flonase is active for 12-24 hrs on the mucosa. So we recommend either once or twice daily dosing depending on symptom severity.
Answered 3/24/2020
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