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And last summer, two children lost their lives after undergoing extensive dental procedures.
According to a Dallas Morning News investigation in 2015, a dental patient dies nearly every other day in the United States.
Intranasal antihistamines are as effective as intranasal cromolyn, intranasal nedocromil, and leukotriene modifiers in seasonal allergic rhinitis; however, are not as effective at relieving nasal congestion and other symptoms as intranasal glucocorticoids.
The ones you see in over-the-counter sleep aids are usually diphenhydramine and hydroxyzine.
(There are other types of antihistamines that affect H-2, H-3, and H-4 receptors.) People build up tolerance to them over time and when they stop taking them experience rebound insomnia.
Trials have not consistently shown that one antihistamine is more effective than another, although one trial did report cetirizine reducing symptoms to a greater extent.
Intranasal or ophthalmic (into the eye) antihistamines have a quicker onset of action than oral antihistamines (within about 15 minutes); however, need to be administered several times daily.