Antihistamines are used to treat a variety of allergic disorders. They work by blocking the actions of a chemical called histamine, which is released by special cells of the body's immune system and triggers a number of the symptoms associated with allergic reactions. There are many different antihistamines available both over the counter and by prescription. They are often given as needed to treat the symptoms resulting from an allergic reaction to a food. You should discuss with your doctor which antihistamine to use (and the appropriate dose) if you or your child has an allergic reaction. It should be remembered that antihistamines start working relatively slowly and that the first drug of choice for treating significant or progressing reactions is injected epinephrine.
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