Asthalin Syrup 100ml is a medication primarily used to treat respiratory conditions, particularly those that cause bronchospasm and airway constriction, such as asthma and chronic obstructive pulmonary disease (COPD). It contains Salbutamol (also known as albuterol), which is a bronchodilator. This drug works by relaxing the muscles around the airways, allowing them to open up and make breathing easier.