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Effect of Antihistamines on Allergic Rhinitis
Antihistamines help reduce or block the action of histamine, a chemical that is released when the immune system reacts to an allergen. The release of histamine leads to the symptoms of allergic...
Read more about Allergic Rhinitis and Antihistamines.
Effect of Antihistamines on Viral Upper Respiratory Infections (Colds and Influenza)
Antihistamines interfere in the action of substances (histamines) that cause the inflammation-related symptoms of cold and flu (such as runny nose and congestion).