FACT
Intranasal corticosteroids (INS) are a class of allergy medicine, available in Canada without a prescription. Flonase Allergy Relief is part of this class of medicine. Flonase works by helping to control 6 of the key inflammatory substances (including histamine) your body produces that cause allergy symptoms. *
*Mechanism vs. most OTC allergy pills. FLONASE® Allergy Relief acts on multiple inflammatory substances (histamine, prostaglandins, cytokines, tryptases, chemokines, and leukotienes). The exact number and precise mechanism are unknown.