Asthma is a chronic inflammatory lung disease. Asthma affects personnel in all ages but mostly starts in childhood. Asthma creates inflammation in the inside walls of airways which makes airways very sensitive for the allergic reaction. Asthma may be caused due to genetic, environmental factors or combination of both. Almost all asthma sufferers have allergies. Some of the allergens are house dust mites in carpets, bedding and furniture, pet dander, pollens, moulds, air pollution, tobacco smoke, chemical irritants in the workplace and others. Some of the symptoms of asthma are coughing, wheezing, trouble in breathing and chest tightness. On the basis of class of drug, asthma market can be segmented into bronchodilators, mast cell stabilizers, leukotriene antagonists, immunosuppressants and combination of ICS/LABA. Asthma can be classified into four categories include exercise included asthma, childhood asthma, allergic asthma and occupational asthma. Some of the medication for asthma treatment includes short-acting beta2-agonists, oral corticosteroids, methyxanthines, long-acting bronchodilators, monoclonal antibodies, mast cell stabilizers, leukotriene modifiers and inhaled corticosteroids.