Telfast Tablets contains Fexofenadine in it. Fexofenadine HCL is antihistaminic agent. Histamine mediates allergic and inflammatory reactions. In addition Fexofenadine HCL used to relieve allergy symptoms such as watery, ithcy, red eyes, sneezing, runny nose. While on the other hand Telfast-D contains Fexofenadine and Pseudoephedrine HCL an anti allergy combination and used for reducing symptoms of Rhinitis.