Allergy is a hypersensitive immune response from otherwise harmful substances that either enter or come into contact with the body. Such substances generally include pet dander, pollen, or bee venom. Almost anything can act as an allergen if the immune system has an adverse reaction.

Any substances that triggers an allergic reaction is called an allergen. They may be found in food, drinks, or the environment. Many allergens are harmless and do not affect most people. If a person is allergic to a substance, such as pollen, their immune system reacts to the substance as if it was foreign and harmful, and tries to destroy it. During such reaction, histamines are released from the immune system that cause the tissue in your nose to swell (making it stuffy) and your eyes, nose, and sometimes mouth to itch.

Antihistamines reduce or block histamines, so they control and stop the allergy symptoms.

These medicines work well to relieve symptoms of different types of allergies, including seasonal (hay fever), indoor, and food allergies.

Antihistamines are available through our online prescription service.