The usage, dosage and duration of dosage of Doxophylline should be given under the supervision of a doctor and formulated accordingly. Usually it is given 2 times/day, i.e. every 12 hours for 5-10 days as a course of treatment. Doxophylline Injection is an injectable medication used for bronchial asthma, chronic asthmatic bronchitis, and other bronchospasm-induced breathing difficulties. This medicine is a prescription drug and should only be used after a standardized treatment in a hospital to clarify the premise of the above mentioned diseases. For bronchial asthma, bronchitis, and other causes of dyspnea, it is necessary to undergo a standardized treatment in the hospital and be judged by a doctor. For the infusion of medicines, the main medical institutions for use, follow the doctor’s instructions, any problems with timely response to the health care personnel. Use the drug for a period of time to the hospital for regular review and follow-up, to observe whether the symptoms or disease has been significantly relieved or cured. Some patients can have a series of adverse reactions after using the drug, common such as nausea, vomiting, headache, insomnia, palpitations, skin itching and other symptoms. If adverse reactions occur, doxophylline should be promptly discontinued, and if necessary, doxophylline blood concentration monitoring is feasible.