The main action of Dosophylline Injection is to calm asthma and antispasmodic. Dosophylline Injection belongs to the theophylline group of medicines and is a bronchodilator that acts as a therapeutic agent by inhibiting the corresponding enzyme in smooth muscle cells. It can be used to treat chronic bronchitis, asthma, emphysema and other diseases. The dosage of Doxophylline Injection should be careful, as overdose will cause nausea, abdominal pain, headache and other adverse symptoms. 1. Chronic bronchitis: chronic bronchitis is inflammation of the bronchial mucosa and its surrounding tissues caused by infectious or non-infectious factors. It is generally associated with chronic irritation of the environment, such as smoking, air pollution, etc. 2. Asthma: Asthma is a chronic airway disease, the main symptom is inflammation of the airways, asthma is recurrent, often at night and early morning attacks. 3. Emphysema: Emphysema is a chronic obstructive pulmonary disease (COPD), which is usually not completely curable, and is treated with interventions to ease the progression of the disease. Patients with emphysema experience chest tightness and shortness of breath during activity, which can be diagnosed through lung X-rays. Drugs should be used under the guidance of a professional physician, and should not be used arbitrarily on their own.