The video will talk about the formula of two to classify the severity of asthma by Dr. K K Aggarwal, Padma Shri Awardee, Editor-in-chief IJCP Publications. If any asthmatic gets an more than two attacks of asthma at night in a month or more than two attacks of asthma during day time in a week or he finishes more than two canisters of asthma inhalers in a year then he needs persistent asthmatic treatment and inhaled corticosteroids. Dr. Aggarwal will also talk on how to decide whether canisters will last long. If two puffs twice a day are used then the canister will last for 30 days. Such patients who use two puffs twice a day have chronic persistent asthma and will require continued treatment of asthma with a maintenance therapy of corticosteroids.