Inclusion Criteria:  Children between 2 to 12 years of age. Children with the diagnosis of asthma having a pram score of more than 4. Children with reactive airways  Exclusion Criteria:  Critically ill children who require intubation or mechanical ventilation. Having hypersensitivity or allergy to MgSO4. with history of chronic lung impairment. Whose parents are not giving informed consent for participation in research.