The pharmacodynamic mechanism of action of aminophylline: 1. relaxes bronchial smooth muscle and has a relieving effect on bronchial congestion and edema. 2. increases cardiac output and dilates the input and output glomerular arteries. 3. increases the contractility of isolated skeletal muscle. Then in treatment mainly treats bronchial asthma, wheezing bronchitis, emphysema, especially obstructive emphysema, which can relieve its symptoms. Aminophylline has the most direct relaxing effect on the smooth muscle of the respiratory tract. It is recommended that patients must follow medical advice when using aminophylline to use it symptomatically to avoid side effects and related complications caused by incorrect usage. It is also important to note that aminophylline can also be used for the treatment of heart failure and often cardiogenic asthma.