| http://www.w3.org/ns/prov#value | - Symptoms of both forms of allergic rhinitis include nasal congestion, runny nose, sneezing, and itching of the nose.1 Mechanism of Action Astepro is a phthalazinone derivative that displays histamine H1-receptor antagonist activity.3 Clinical Trials Astepro was evaluated in a total of 7 double-blind, placebo-controlled clinical trials that lasted from 2 to 4 weeks.
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