Allegra tablets are used in the treatment of seasonal allergy symptoms in adults and children. The product is an antihistamine that blocks the effect that
histamine has on the body while reducing allergy symptoms such as runny nose, sneezing and itchy or watery eyes. Allegra is also used to treat hives and itchy skin. It is usually well tolerated with very few side effects. Common side effects of Allegra include coughing, headache, back pain and dizziness.