COLFEX, Fexofenadine Hydrochloride Suspension is an antihistamine that relieves many allergy symptoms. This medication blocks a natural substance known as histamine that your body makes during an allergic reaction. To self-treat, read all instructions on the 60ml bottle label before using the over-the-counter product. A pharmacist can answer any questions you may have. You should take this medication as directed by your doctor, normally twice a day. Consult your doctor or pharmacist if you have kidney disease before taking this medicine.