Hello You mentioned that you are having asthma and taking asthalin ( salbutamol) and now one doctor prescribed lmontus ( levoceterizine+ monteleukast ) . Asthalin causes bronchodilation , while lmontus only an anti allergic (these both drugs ). You are having ASTHMA , so in my opinion asthalin will be more useful than lmontus . When as asthmatic patient visit my clinic I advise my patient to take montelukast+ bambuterol one tablet in the night and also whenever an attack of allergy or asthma . Once relief in symptoms stop the drug and whenever require take it . No side effect , no addiction and above all safe . Hot coffee and steam inhalation also provide relief in such cases. Good luck for you.