How Long Is Flonase Good For Once Opened. The effectiveness of flonase is dependant on regular use. Always keep unused nasules® in the foil and dispose of any which are unused after this time.
Prime the spray if it has not been used for more than 7 days (fluticasone propionate) or 30 days (veramyst®) or if the cap has been left off the bottle for 5 days or longer. In adults, the dosage for flonase is usually 2 sprays in each nostril once daily, or 1 spray in each nostril twice daily. Flonase may take several days to reach its full effect when used for allergic rhinitis symptoms.