Allacan Hay Fever and Allergy Relief. **Key Benefits:** - Fast and effective 24-hour relief - One per day - Non-drowsy antihistamine Allacan Cetirizine Tablets provide fast and effective 24-hour relief in adults from the annoying symptoms of hayfever and /or indoor allergies. For the relief of symptoms of allergic conditions such as Hay Fever, Dust Allergy, Pet Allergy, Skin Allergy. Cetirizine is known as a non-drowsy antihistamine. It\'s much less likely to make you feel sleepy than some other antihistamines. What is an allergy? An allergy is a disorder of the immune system which, causes an exaggerated response within the body when you come into contact with a foreign substance, that would be harmless in most people. The contact can be with your skin, mouth, gullet (oesophagus), stomach, intestine or with the lining of your lungs. Substances in the environment that cause the response are known as allergens and someone who suffers a response to a particular allergen is said to be allergic to it. If you are allergic to a particular allergen you may suffer from a mild cough or a sneeze attack, but for others the symptoms can be much more severe, and can even lead to death. Almost any substance can be an allergen for someone. Allergies are generally the body’s way of eliminating something it considers unsuitable. Allergies are responsible for many illnesses, especially in young children. If you think you have an allergy, you must contact your doctor who will help you to control the symptoms.