Fenofex 120 mg is an antihistamine containing fexofenadine hydrochloride, used to relieve symptoms associated with allergic rhinitis (hay fever) and chronic hives (urticaria). It works by blocking the action of histamine, a substance in the body that causes allergic symptoms such as sneezing, itchy eyes, and a runny nose. Fexofenadine is a second-generation antihistamine, meaning it is less likely to cause drowsiness compared to first-generation antihistamines. The medication is taken once daily and helps reduce symptoms like itching, swelling, and redness caused by allergies.