question: Hi, am Anjan and am from Chennai. I am Allergic to smoke and dust because of that I start sneezing and get running nose. I always have cold and severe at times. Initially i consulted an ENT who prescribed me with duonase(nasal spray)and a  tablet by name allegra. Which gave me relief for few days but not a permanent one. Now i ve been taking Montek LC for about 8 months. I feel better when i take the tablet but when i miss a day or two i get severe cold again. Why is it so?