Dihydroxypropyl Theophylline Injection is an asthma medication for wheezing symptoms of bronchial asthma and chronic obstructive pulmonary disease. 1. Bronchial asthma: Bronchial asthma is a chronic inflammatory disease of the airways, and the spasm of the airways during an attack causes wheezing and difficulty in expiration. Dihydroxypropyl Theophylline Injection can improve the symptoms of wheezing and dyspnea by relieving airway smooth muscle spasm. 2. Chronic Obstructive Pulmonary Disease (COPD): COPD is an irreversible restriction of airflow caused by various physical and chemical factors, repeated airway infections, etc., which is manifested as wheezing, dyspnea and other symptoms. Dihydroxypropyl theophylline injection can dilate airways to improve ventilation. Dihydroxypropyl theophylline injection can have adverse effects such as nausea, insomnia, cardiac arrhythmias, and increased heart rate. Contraindications are patients with active peptic ulcer and uncontrolled convulsive disorders. Use with caution in pregnant, maternal and lactating women. Dihydroxypropyl theophylline injection is a clinical prescription drug, in order to use the drug safety, not self-medication, need to go to the hospital by the physician issued a prescription for medication.