IRCT20171227038108N1 IRCT 2018-01-28 Research and Technology dept of Mazandaran University Of Medical Science effect of montelukast in athma exacerbation The effect of oral Montelukast on lung function and clinical symptoms of asthma exacerbation in Imam Hospital`s patient 2018-01-21 anticipated 140 Complete https://irct.ir/trial/28836 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Patients to be coding in bases of Table of random number,then divide to two groups.Control and intervention groups, Blinding description: Analyzer coding patients in basis of table of randum numbers.patients,research fellow and avaluator of events kept to blind. 3 Asthma exacerbation. Intervention 1: Intervention group: The patients that treat with montelukast 10 milligram overnight and asthma exacerbation. Intervention 2: Control group: The patients that take placebo tablet in addition to approved asthma exacerbation treatment. No - There is not a plan to make this available Justification or reason for not sharing IPD is patient dissatisfaction