Aminophylline works and is effective in relaxing bronchial smooth muscle and relieving chest tightness and shortness of breath. It is generally used in the treatment of wheezing bronchitis, bronchial asthma, chronic obstructive pulmonary disease, and also in the treatment of asthma caused by cardiogenic pulmonary edema. Aminophylline is a phosphodiesterase inhibitor that dilates bronchial tubes by relaxing bronchial smooth muscle. Aminophylline can relax bronchial smooth muscle, reduce airway spasm, relieve congestion and edema of bronchial mucosa, and can be used to treat wheezing bronchitis, bronchial asthma, chronic obstructive pulmonary disease, bronchiectasis and other causes of chest tightness and wheezing. Aminophylline can dilate peripheral blood vessels and coronary arteries, elevate myocardial contractility, enhance myocardial blood supply, and also treat asthma caused by cardiogenic pulmonary edema. Aminophylline can also increase renal blood flow, enhance renal filtration rate, diuretic effect is significant, can relieve edema. Side effects of aminophylline are commonly associated with panic, arrhythmia, hand tremors, dizziness, euphoria, nausea, vomiting, and skin rash. Patients are advised to use aminophylline as prescribed by the doctor and seek medical attention for any discomfort.