This cross-sectional questionnaire based study was carried out in a referral chest public hospital of Delhi. Patients attending the emergency room (ER) for treatment of their acute attack were enrolled for the study. After the patients were clinically stable, were asked to participate in the study. Patients, 18-60 years of age, previously diagnosed of persistent asthma with spirometry, having at least one prescription of inhaled corticosteroids and registered as out-patient in the study hospital for at least one year were included in the study. Non-cooperative patients were excluded from the study. The protocol of the study was approved by the institutional ethics committee. Patients were enrolled after obtaining written informed consent.