Bilastine is an antihistamine medication that helps reduce allergy symptoms. It works by blocking histamine, a substance in the body that causes allergic reactions. This medication comes in an orodispersible form, which means it dissolves quickly in your mouth.

Ebastine is an antihistamine that helps relieve allergy symptoms such as sneezing, runny nose, and itchy eyes. It works by preventing histamine from causing allergic reactions in your body. This medication comes in a form that dissolves in your mouth.

Desloratadine is an antihistamine medication that treats allergy symptoms by blocking the effects of histamine in your body. Like the other medications in this trial, it comes in an orodispersible form that dissolves quickly when placed on your tongue.

Allergy – A condition where the immune system reacts abnormally to substances (allergens) that are usually harmless to most people. When an allergic person encounters specific allergens, their body releases chemicals like histamine, causing symptoms such as sneezing, itching, rashes, and swelling. The reaction can occur immediately or within a few hours after exposure to the allergen. Allergies can affect various parts of the body, including the skin, respiratory system, and digestive tract. The severity of allergic reactions can vary from mild discomfort to more intense symptoms, and people may be allergic to multiple substances.