What is fexofenadin?

Fexofenadine is an antihistamine medication used to treat seasonal allergies, such as hay fever. It works by blocking the effects of histamine, a substance in the body that causes allergy symptoms like sneezing, runny nose, and itchy eyes. Fexofenadine is generally taken once a day and has a longer duration of action than other antihistamines, meaning it can provide relief for up to 24 hours. It is considered to be non-drowsy, although it may cause some mild side effects such as headache, dry mouth, or nausea. Fexofenadine is available in both prescription and over-the-counter forms.