Allergies Home > Understanding How Allegra Works and Its Effects
How Does Allegra Work?When you come in contact with something you're allergic to, a chain reaction begins inside your body. During this chain reaction, specialized cells release powerful chemicals. Some of these chemicals can trigger swelling of the nasal passages leading to nasal congestion (a "stuffy nose"). Other chemicals, such as histamine, can cause sneezing, itching, and irritation.
Effects of AllegraPrior to Allegra's approval in the United States, a number of clinical studies were conducted on over 4,500 adults and children to determine the safety and effectiveness of Allegra. These studies analyzed the effects of Allegra on both seasonal allergy symptoms and chronic hives. In these studies, people taking Allegra experienced relief of their symptoms compared to a group of people who did not take the medicine. Allergy relief was measured based on a symptom score that rated changes in the following symptoms:
- Runny nose
- Itchy nose or throat
- Itchy, watery, or red eyes.