Nasacort is a corticosteroid that treats year-round and seasonal allergy symptoms. It also treats nasal allergic symptoms such as stuffy/runny nose, sneezing and itchy eyes/nose/throat. Nasacort belongs to the drug class nasal steroids, and it is available in generic form as Triamcinolone. It has another brand name Nasacort AQ. Nasacort acts by decreasing swelling or the inflammation in the nasal passages.