Aminophylline one tablet a day can not be taken for a long time, need to be dynamically adjusted according to the symptoms of the disease. Aminophylline has the effect of dilating bronchial smooth muscle, so it is commonly used in the clinic to relieve the symptoms of asthma and chest tightness. However, aminophylline is a high-alert drug, after the drug enters the body, the blood concentration is generally above 10mg/L, there is a therapeutic effect, but when the concentration reaches 15 to 20mg/L, it may induce poisoning. Therefore, the therapeutic window of the drug is narrower, and the individual differences are larger, and poisoning often occurs due to bad drug taking. Due to the existence of individual differences, long-term use of the drug may still occur nausea, stomach upset, vomiting and other systemic reactions, cardiovascular system reactions such as arrhythmia, increased heart rate, and in severe cases, even respiratory and cardiac arrest and death. Therefore, it is not recommended to blindly take this drug for a long period of time, and you need to take the drug according to your own actual situation and with the advice of your doctor.