Used as an antihistamine to relieve symptoms of allergies such as sneezing, runny nose, itching, and watery eyes. Commonly found in over-the-counter allergy medications. Also used to treat symptoms of the common cold and hay fever. Has mild sedative effects, so it may be included in nighttime cold and allergy formulations. Some studies suggest potential in promoting remyelination in neurological conditions, making it a subject of interest in research for diseases like multiple sclerosis.