This randomized clinical trial will include 126 patients after taking informed consent who will meet the eligibility criteria. Patients will be randomly distributed in 2 groups on alternate basis as computerized generated number. Improvement will be assessed in terms of clinical condition i.e., Heart Rate, Respiratory Rate, blood pressure, pattern of breathing oxygen saturation and Pediatric Respiratory Assessment Measure (PRAM) score at start of treatment and then afterwards at 20 min interval up to 1 hour and then at 2nd hour and then after every 6 hours for 24 hours.
In this study investigators will use magnesium sulphate in the nebulized form in children between 2 and 12 years of age as an acute reliever for acute severe asthma. Aim of this study is to determine that whether adding low (250mg), intermediate (500mg), and high doses (750mg) of magnesium sulphate in the 1st hour of treatment has any difference in the improvement of clinical condition of the patient and length of hospital stay. There will be total 108 patients having 2 groups. 1st group will receive only Ventolin while 2nd group will be given Ventolin and Magnesium sulphate.