Deriphyllin OD 450 Tablet is a bronchodilator used to treat symptoms of asthma and chronic obstructive pulmonary disease (COPD). It contains the active ingredients theophylline and etofylline, which help relax the muscles in the airways, improving airflow to the lungs. This action helps alleviate symptoms such as coughing, wheezing, and shortness of breath. Common side effects may include nausea, vomiting, headache, restlessness, dizziness, irregular heartbeat, and stomach upset