Asthalin Respules contain salbutamol, a bronchodilator medication used to relieve symptoms of asthma, chronic obstructive pulmonary disease (COPD), and other respiratory conditions. They are administered via a nebulizer to deliver the medication directly into the lungs, helping to relax the muscles in the airways, improve airflow, and alleviate symptoms such as wheezing, coughing, and shortness of breath.