Telfast is a prescription-only oral antihistamine used to treat the symptoms of hayfever and seasonal rhinitis. Hayfever is an allergic condition that is triggered by pollen. The symptoms of this allergy include sneezing, runny nose, watery and itchy eyes and hives. Rhinitis is the medical term for inflammation of the inside of the nose, which is caused by allergens like pollen, dust or animal skin. Both hayfever and rhinitis are very common conditions, with each affecting one in five people in the UK. Telfast contains the active ingredient fexofenadine, which helps to alleviate symptoms of these troublesome health problems. Also available at Click Pharmacy is the generic version of the medicine by the name Fexofenadine, which is a cheaper version of the brand product.