Dihydroxypropyl Theophylline has the effect of relieving wheezing symptoms of bronchial asthma and other diseases. Side effects such as headache, insomnia, palpitations (rapid heartbeat, often accompanied by panic), nausea, vomiting and other side effects may be manifested after use of the drug, usually relieved after discontinuation of the drug, if it continues to be unrelieved, it is necessary to consult a doctor for treatment in a timely manner. Allergic to the product or allergic to other theophyllines, patients with active peptic ulcer, patients with uncontrolled convulsive disease is prohibited. The drug should be used with caution in pregnant and lactating women, liver and kidney impairment, cardiac insufficiency, hyperthyroidism, prostate hyperplasia. Combination of this product with erythromycin, lincomycin, clindamycin and other drugs may cause drug accumulation and should be avoided as much as possible. Dihydroxypropyl theophylline should be used under the supervision of a clinician.