The dosage of aminophylline tablets is: ① Adults commonly used: oral, once 0.1~0.2g, 0.3~0.6g a day; maximum dose: once 0.5g, 1g a day. ② Pediatric commonly used: oral, each time according to the weight of 3~5mg/kg, 3 times a day. The drug is a purine receptor blocker, which not only has a respiratory contraction effect against adenine and so on, but also enhances the diaphragm contraction force, which has the function of improving respiration. Clinically the drug is not only used for the treatment of bronchial asthma, wheezing bronchitis, obstructive emphysema and other symptoms; it is also used for the treatment of asthma caused by cardiogenic pulmonary edema. During the use of the drug there are adverse reactions such as nausea, vomiting, agitation, insomnia. It is contraindicated in patients with hypersensitivity to the drug, with active peptic ulcers and uncontrolled convulsive disorders. The drug is not suitable for patients with persistent asthma or acute bronchospasm attacks; use with caution in patients with hypoxemia, hypertension or a history of peptic ulcer; use with caution in pregnant and lactating women. If you need to use the drug, should be used under the guidance of a physician, not self-medication to avoid adverse reactions.