Windel Syrup 100 ml is a bronchodilator manufactured by Incepta Pharmaceuticals Ltd., containing 2 mg of salbutamol sulphate per 5 ml. Salbutamol is a selective β₂-adrenoceptor agonist that acts on bronchial smooth muscle to induce rapid bronchodilation, providing relief from reversible airway obstruction. It is indicated for the treatment of conditions such as asthma, chronic bronchitis, emphysema, and other respiratory disorders associated with airway obstruction. Windel Syrup offers a fast onset of action (within 5 minutes) and a duration of effect ranging from 4 to 6 hours. The recommended dosage varies by age: