Hi welcome to health care magic.... I can understand your concern.... You have asthma that is allergic disorder ..So for that you are given Montelukast plus levo cetrizine combination drug which will help in relieving allergic inflammation..... So yes it is correct one.... But i would like to tell you that if repeated asthma attack there than inhaler should not be stopped ... Maintenance inhaler has to be taken to improve air flow... To assess severity spirometry done and accordingly further management .... Second here purchase one peak flow meter at home and regular monitor your peak air flow and than accordingly further dosage decided for inhaler .. And it will also monitor your response to therapy ...... Hope your concern solved ... Consult pulmonologist for examination.... Take care ,....