Final answer:
Flonase, an intranasal corticosteroid, is the first line treatment for seasonal allergic rhinitis, effectively alleviating symptoms like runny nose and allergy eyes.
Step-by-step explanation:
The first line treatment for seasonal allergic rhinitis is intranasal corticosteroids such as Flonase (fluticasone). These medications are preferred due to their efficacy in reducing inflammation and treating the major symptoms of allergic rhinitis, which can include a runny nose, sneezing, and itchy, watery allergy eyes. Intranasal corticosteroids are effective in controlling the immune response and alleviating the unpleasant symptoms associated with hay fever.