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Allergic reaction is caused when histamines are released in the body when one’s body starts an allergic reaction; it can make his eyes itchy and watery. In that case antihistamines are the first medicines prescribed which blocks the histamine effects. Some medicines combine an antihistamine and a decongestant. Examples of over-the-counter antihistamines: Allegra (fexofenadine), Benadryl (diphenhydramine), Claritin, Alavert (loratadine), Zyrtec (certirizine), etc.
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