Theophylline in aminophylline is a purine receptor blocker, which counteracts the contractile effects of adenine and others on the respiratory tract. Theophylline can enhance the diaphragm contraction force, especially in the diaphragm contraction weakness, the effect is more significant, so it is beneficial to improve respiratory function. Aminophylline belongs to the respiratory system of asthma drugs can be used to relieve bronchospasm, but also play a role in strengthening the contractility of the heart muscle. The drug is used to treat bronchial asthma, obstructive emphysema and asthma caused by cardiogenic pulmonary edema. Nausea, vomiting, agitation, insomnia, etc. may occur after taking the drug, which can be gradually recovered after stopping the drug; symptoms such as fever, water loss, convulsions, etc. should be consulted in the hospital. Aminophylline is prohibited in patients who are allergic to theophylline, in patients with uncontrolled convulsive disorders, and should be avoided in pregnant and lactating women. Aminophylline is a prescription drug, need to be used under the guidance of a doctor, do not use or increase or decrease the dosage without authorization.