Allegra (fexofenadine) is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
Ask a doctor or pharmacist before taking Allegra if you are allergic to any drugs, or if you have kidney disease.
There may be other drugs that can affect Allegra. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.
Stop using Allegra and get emergency medical help if you think you have used too much medicine, or if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Tell your doctor if your symptoms do not improve, or if they get worse after you start taking Allegra. Never use more than the recommended dose.