Hi, It seems you are having allergic rhinitis. Because you reported you were having frequent episodes of cough and cold, sneezing whenever you stopped those medication particularly in the month of winter. Montelukast -levocetrizine has few side effects such as abdominal discomfort, dryness of nose, drowsiness, blurred vision, dry mouth but occurrence of these side effects are rare. But I will advice you to take fluticasone- azelastine nasal spray one puff through each nostril twice daily. Along with that, you should take montelukast-levocetrizine tablet once daily at bedtime. Then after two weeks you switch to levocetrizine once daily. I will advocate you not to take montelukast more than two weeks. You will feel lot better with these medications. You will probably get rid of symptoms within three symptoms. You may also take influenza vaccine once in year in the winters. This will also reduce occurrence of cough and colds and will also reduce the severity of the illness. Hope, I satisfied your queries.