Multiple options: "hay fever" often refers to allergic rhinitis or other forms of rhinitis or a runny nose. The runny nose and congestion are caused by chemical mediators like histamine or leukotrienes. So taking antihistamines like Benadryl (diphenhydramine) and loratidine (claritin) help block the chemical mediators your body produces and helps stop the symptoms. Nasal sine, decongestants, steriid nose prays can help as well.
Answered 3/9/2015
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