Allegra (Fexofenadine) blocks the allergic reaction by minimizing or preventing the body's reaction to the allergen.

Allergy is a hypersensitivity disorder of the immune system.[1] Allergic reactions occur to normally harmless environmental substances known as allergens; these reactions are acquired, predictable, and rapid. Strictly, allergy is one of four forms of hypersensitivity and is called type I (or immediate) hypersensitivity. It is characterized by excessive activation of certain white blood cells called mast cells and basophils by a type of antibody known as IgE, resulting in an extreme inflammatory response. Common allergic reactions include eczema, hives, hay fever, asthma attacks, food allergies, and reactions to the venom of stinging insects such as wasps and bees.

ALLERGA (Fexofenadine hydrochloride) is proven to provide powerful relief of the wide range of symptoms including sneezing, runny nose, itchy nose, palate, and throat, and itchy, watery, red eyes.

That was a great lot of information. Thanks for that Blinaitle! At this time of year there are a lot of people suffering a lot of misery with hay fever and the kind of allergies that are most common the summer, not to mention those people like me who react very badly to insect bites and stings. I will certainly try this preparation as I regularly suffer the misery of hay fever and also have even had to go to hospital when I have had a really bad reaction to bites and stings.