I suffer from allergic rhinitis inclusive of scratchy throat with sticky thin mucus almost every day. Doctor suggested levocetrizine which helps but i am not sure how long i can take it?? Because as soon as I stop within a day, symptoms return. I know the trigger factors but it cannot be avoided so medicine is the only help. How long can I take levocetrizine?? Or any drug that can be safely taken everyday to control the said symptoms.