Thanks for your question on Health Care Magic. I can understand your concern. Asthma is allergic disease. It needs regular treatment in the form of anti allergic drug and inhaled treatment. Best way to control allergy is identification of allergen and if possible complete avoidance of it. So avoid dust, pollens, mites, animal fur, smoke etc. Wear face mask every time you go outside home. Montair FX is having montelukast and fexofenadine. Montelukast is anti allergic drug and fexofenadine is antihistamine drug. Both are safe for long term without any side effects. So continue montair FX, it is good drug for asthma control. Also continue long acting inhaled bronchodilators and inhaled corticosteroid (ICS). You should take these drugs for prolonged period (atleast 1-2 years). Further tapering of drugs is based on PFT (Pulmonary Function Test) report. So consult pulmonologist and discuss all these. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.