Allegra is a type of medication called an antihistamine. Histamine is a natural chemical found in the body that is part of the immune system. Histamine causes sensitive people to overreact to certain environmental triggers. When the body overreacts, allergy symptoms occur. Allegra works by blocking the effects of histamine, which prevents the symptoms of sneezing, runny nose and itchy, watery eyes.

Allegra is also a non-sedating medication, meaning unlike many other antihistamines, especially over-the-counter medications, it does not cause sleepiness. Get relief from allergy symptoms in as little as an hour AND still feel awake and alert.