Dosophylline is effective on the same day after taking it. Clinically, Dosophylline belongs to methylxanthine derivatives, also belongs to a kind of bronchodilator, after the use of the bronchial tubes, and relax the smooth muscle of the bronchial tubes. It can also inhibit the phosphodiesterase in the smooth muscle cells to achieve the effect of relaxing the smooth muscle, and can also inhibit asthma attacks. It is mainly used in the treatment of bronchial asthma, wheezing chronic bronchitis and other diseases. Usually the drug can be absorbed rapidly by the mouth after taking, usually in about 1 hour will be able to reach the peak concentration of the drug, so as to play the effect of the drug. Therefore, Dosophylline can be effective in about 1 hour after taking it, and finally it will stay in the body for about 8 hours and will be excreted from the body in the form of urine. Dosophylline may cause diarrhea, nausea, vomiting and other discomforts, and is contraindicated in patients with acute myocardial infarction. The use of medication should be decided by a doctor after a comprehensive assessment of the condition, and should not be taken privately to avoid adverse reactions.