For patients with allergic rhinitis, twice-daily azelastine plus fluticasone cut nasal symptoms ... Add-on oral antihistamines or montelukast (Singulair) do not add much benefit.

Just a few puffs into each nostril, and you're protected against infection from nasty cold viruses - that is, according to claims made for many nasal sprays. Can they really do this?Well, not directly ...