What antihistamine treat catarrh?

Antihistamines such as loratadine, cetirizine, and diphenhydramine are commonly used to treat catarrh, which is characterized by excessive mucus production in the nasal passages. These medications work by blocking the action of histamine, a substance in the body that contributes to allergy symptoms and inflammation. By alleviating these symptoms, antihistamines can help reduce nasal congestion and improve overall comfort. It's important to consult a healthcare professional for appropriate recommendations based on individual needs.